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NextGate — PONA Auth

Progressive · Onboarding · Native · Access

Version 3.0 — The Complete Authentication Specification

Phone-first. Passwordless by default.
One flow. No walls. Trust earned progressively.

Philosophy

One entry point — phone number only, always
One auth system — no separate lite or hard auth flows
Passwordless by default — password is an optional enhancement set later
Progressive onboarding — primary is mandatory, secondary collected only when a resource needs it
One token type — access token carries onboarding flags
Persistent identity — device remembers who you are, you never type your number twice
Channel choice — passwordless users pick where they receive their OTP

Token Types

Token	Lifespan	Purpose	Issued At
`checkToken`	5 mins	Signed phone carrier — binds all auth actions to one account	`/auth/check`
`tempToken`	10 mins	OTP handshake only	`/auth/start`, `/onboarding/email/initiate`
`onboardingToken`	7 days	Primary flow only — unlocks name and age steps only	After OTP verified, primary incomplete
`accessToken`	1hr (no password) / 7 days (with password)	Full session, carries onboarding flags	After primary complete
`refreshToken`	30 days	Silent refresh, password users only, rotated on use	After password login

What "Primary Complete" Means

Three requirements. All three done before access token is issued. No skip. No cancel.

✅  Phone verified via OTP
✅  First name + Last name set
✅  Date of birth set (age calculated → account tier assigned)

Account Tiers — Set at Age Step

Age	Tier	What It Means
Under 13	Blocked	Account deleted. Phone blocklisted. Cannot return until 13th birthday.
13 — 17	Restricted	Age-restricted content hidden. Some commerce limited.
18+	Full	No restrictions.

Onboarding Flags (Inside Access Token)

Derived from actual account data. No separate database column needed.

Flag	Means
`primaryComplete`	Phone verified + name set + date of birth set
`username`	Real username chosen — not a system temp one
`email`	Email submitted AND verified via OTP
`profilePic`	At least one profile picture uploaded
`interests`	At least 3 interests selected
`bio`	Bio text written

Access Token Shape

{
  "sub": "su_uuid",
  "flags": {
    "primaryComplete": true,
    "username": false,
    "email": false,
    "profilePic": false,
    "interests": false,
    "bio": false
  },
  "exp": "2026-04-01T12:00:00Z"
}

Resource Permission Matrix

Feature	Needs Primary	Needs Secondary
Browse events / listings	❌ No auth	—
React / like	✅	nothing extra
Buy ticket or product	✅	nothing extra
Share listing	✅	nothing extra
Comment publicly	✅	`username`
Follow someone	✅	`username`
Send a message	✅	`username`
Create an event	✅	`username` + `email`
Open a shop	✅	`username` + `email`
Sell a product	✅	`username` + `email`
Withdraw money	✅	`username` + `email` + `profilePic`
Age-restricted content	✅ must be 18+	nothing extra

Secondary Field Priority Order

Backend returns missing fields one at a time in this order. User never sees all missing fields at once.

1 — username      (needed for almost all social features)
2 — email         (needed for commerce and trust)
3 — profilePic    (needed for high-trust actions)
4 — bio           (rarely hard-required)
5 — interests     (feed personalization, almost never hard-required)

Auth Method Validation

Every auth endpoint validates the user has the method they are trying to use.

Endpoint	Validation
`/auth/login/password`	Account must have password set
`/auth/login/oauth` Google	Google must be linked to this account
`/auth/login/oauth` Apple	Apple must be linked to this account
`/auth/password/forgot/initiate`	Account must have password set
`/auth/passwordless/channels`	Always allowed
`/auth/start` OTP	Always allowed — passwordless available to everyone

OTP Channel Selection

Passwordless users with email set can choose where to receive their OTP. Frontend never passes the raw email or phone — only the channel type enum.

Channel Availability Rules

Channel	Available When
`PHONE`	Always — phone is primary, always verified
`EMAIL`	Only when email is set AND verified on the account

Action Codes — Complete Reference

Action Code	What Frontend Does
`REGISTER`	New user — show registration intro
`CONTINUE_ONBOARDING`	Returning user, primary incomplete — resume
`LOGIN`	Account ready — show auth method options
`RESTART_AUTH`	Token expired — back to phone entry
`SELECT_CHANNEL`	Multiple OTP channels — show picker
`PROCEED_TO_OTP`	Single channel only — skip picker, go straight to OTP
`USE_OTP`	Wrong auth method chosen — switch to OTP
`RETRY_OTP`	Wrong OTP — error on same screen
`RESEND_OTP`	OTP expired — activate resend
`WAIT`	Rate limited — show countdown
`ACCOUNT_BLOCKED`	Under 13 — show blocked screen
`COLLECT_USERNAME`	Username needed
`COLLECT_EMAIL`	Email needed — submit then OTP verify
`COLLECT_PROFILE_PIC`	Profile picture needed
`COLLECT_INTERESTS`	Interests needed
`COLLECT_BIO`	Bio needed
`PROCEED`	All steps done — retry original action

Response Shapes

Success

{
  "success": true,
  "message": "Human readable message",
  "action": "NEXT_ACTION_OR_NULL",
  "data": { }
}

Error — HTTP 422

{
  "success": false,
  "message": "Human readable message",
  "action": "NEXT_ACTION_CODE",
  "context": "what_user_was_trying_to_do",
  "data": { }
}

Response Examples

/auth/check — New User

{
  "success": true,
  "message": "Phone number not registered",
  "action": "REGISTER",
  "data": { "exists": false, "checkToken": null }
}

/auth/check — Existing User Ready

{
  "success": true,
  "message": "Welcome back",
  "action": "LOGIN",
  "data": {
    "exists": true,
    "checkToken": "eyJ...",
    "primaryComplete": true,
    "maskedPhone": "••• ••• ••78",
    "authMethods": {
      "passwordless": true,
      "password": true,
      "google": true,
      "apple": false
    }
  }
}

/auth/check — Primary Incomplete

{
  "success": true,
  "message": "Continue setting up your account",
  "action": "CONTINUE_ONBOARDING",
  "data": {
    "exists": true,
    "checkToken": "eyJ...",
    "primaryComplete": false,
    "maskedPhone": "••• ••• ••78"
  }
}

/auth/passwordless/channels — Multiple Channels

{
  "success": true,
  "message": "Choose where to receive your code",
  "action": "SELECT_CHANNEL",
  "data": {
    "channels": [
      { "type": "PHONE", "masked": "••• ••• ••78", "isPrimary": true },
      { "type": "EMAIL", "masked": "j••••@g••••.com", "isPrimary": false }
    ]
  }
}

/auth/passwordless/channels — Single Channel Only

{
  "success": true,
  "message": "Sending code to your phone",
  "action": "PROCEED_TO_OTP",
  "data": {
    "channels": [
      { "type": "PHONE", "masked": "••• ••• ••78", "isPrimary": true }
    ]
  }
}

/auth/start — OTP Sent

{
  "success": true,
  "message": "Verification code sent",
  "action": null,
  "data": {
    "tempToken": "eyJ...",
    "maskedDestination": "••• ••• ••78",
    "channel": "PHONE",
    "expiresInSeconds": 120,
    "resendAvailableAfterSeconds": 60
  }
}

/auth/verify — Primary Incomplete

{
  "success": true,
  "message": "Phone verified. Let us set up your account.",
  "action": "COLLECT_PRIMARY",
  "data": {
    "onboardingToken": "eyJ...",
    "nextStep": "name"
  }
}

/auth/verify — Primary Already Complete

{
  "success": true,
  "message": "Welcome back!",
  "action": null,
  "data": {
    "accessToken": "eyJ...",
    "onboarding": {
      "primaryComplete": true,
      "username": true,
      "email": false,
      "profilePic": false,
      "interests": false,
      "bio": false
    }
  }
}

/auth/onboarding/age — Blocked Underage

{
  "success": false,
  "message": "You must be at least 13 years old to use NextGate",
  "action": "ACCOUNT_BLOCKED",
  "context": "underage",
  "data": { "unblockDate": "2027-06-15" }
}

/auth/onboarding/age — Primary Complete

{
  "success": true,
  "message": "Welcome to NextGate!",
  "action": null,
  "data": {
    "accessToken": "eyJ...",
    "accountTier": "FULL",
    "onboarding": {
      "primaryComplete": true,
      "username": false,
      "email": false,
      "profilePic": false,
      "interests": false,
      "bio": false
    }
  }
}

OTP Wrong

{
  "success": false,
  "message": "Incorrect OTP code",
  "action": "RETRY_OTP",
  "context": "otp_verify",
  "data": { "attemptsRemaining": 2 }
}

OTP Expired

{
  "success": false,
  "message": "OTP has expired",
  "action": "RESEND_OTP",
  "context": "otp_expired",
  "data": { "resendAvailable": true, "resendCooldownSeconds": 0 }
}

Rate Limited

{
  "success": false,
  "message": "Too many attempts. Please wait.",
  "action": "WAIT",
  "context": "rate_limited",
  "data": { "retryAfterSeconds": 120 }
}

Wrong Auth Method

{
  "success": false,
  "message": "This account does not use password login",
  "action": "USE_OTP",
  "context": "password_login",
  "data": { "availableMethods": ["passwordless", "google"] }
}

Secondary Gate — Multiple Missing

{
  "success": false,
  "message": "A couple of things needed before you can create events",
  "action": "COLLECT_USERNAME",
  "context": "create_event",
  "data": {
    "currentMissing": "username",
    "allMissing": ["username", "email"],
    "stepsRemaining": 2
  }
}

Secondary Step Done — Next Signalled

{
  "success": true,
  "message": "Username set. One more step.",
  "action": "COLLECT_EMAIL",
  "context": "create_event",
  "data": {
    "accessToken": "eyJ...",
    "nextMissing": "email",
    "stepsRemaining": 1,
    "onboarding": {
      "primaryComplete": true,
      "username": true,
      "email": false,
      "profilePic": false,
      "interests": false,
      "bio": false
    }
  }
}

All Secondary Done — Proceed

{
  "success": true,
  "message": "All done. Creating your event now.",
  "action": "PROCEED",
  "context": "create_event",
  "data": {
    "accessToken": "eyJ...",
    "stepsRemaining": 0,
    "onboarding": {
      "primaryComplete": true,
      "username": true,
      "email": true,
      "profilePic": false,
      "interests": false,
      "bio": false
    }
  }
}

Forgot Password — Reset Complete

{
  "success": true,
  "message": "Password updated. All other sessions signed out.",
  "action": null,
  "data": { "accessToken": "eyJ..." }
}

Flow Diagrams

FLOW 1 — App Open with Stored Accounts

  ┌─────────────────────────────────────────────────────┐
  │  App opens                                          │
  └──────────────────────┬──────────────────────────────┘
                         │
                         ▼
           Read device secure storage
           for stored accounts list
                         │
              ┌──────────┴──────────┐
              │                     │
         NO ACCOUNTS           ACCOUNTS FOUND
              │                     │
              ▼                     ▼
     Show clean phone       Count stored accounts
     entry screen                   │
                           ┌────────┴────────┐
                           ONE              MULTIPLE
                           │                 │
                           ▼                 ▼
                   Auto-call          Show account
                   /auth/check        picker screen
                   in background      User taps one
                           │                 │
                           └────────┬────────┘
                                    ▼
                           /auth/check called
                           for that identifier
                                    │
                                    ▼
                           Show personalized
                           welcome screen with
                           auth method buttons

FLOW 2 — Auth Check (Entry Point)

  ┌─────────────────────────────────────────────────────┐
  │  POST /auth/check                                   │
  │  { "identifier": "+255712345678" }                  │
  └──────────────────────┬──────────────────────────────┘
                         │
                         ▼
           Valid phone format?
              │
   ┌──────────┴──────────┐
   NO                   YES
   │                     │
   ▼                     ▼
  422               Look up in database
  Invalid                │
  phone         ┌────────┴────────┐
                │                 │
           NOT FOUND           FOUND
                │                 │
                ▼                 ▼
       action: REGISTER    Phone verified?
       checkToken: null    ┌──────┴──────┐
                           NO            YES
                           │              │
                           ▼              ▼
                    Release phone  Primary complete?
                    from orphan    ┌──────┴──────┐
                    action: REGISTER NO           YES
                                   │              │
                                   ▼              ▼
                            action:        action: LOGIN
                            CONTINUE_      authMethods
                            ONBOARDING     returned
                                   │              │
                                   └──────┬───────┘
                                          ▼
                                  checkToken issued
                                  containing { identifier }
                                  stored to device on success

FLOW 3 — New User Registration

  action: REGISTER from /auth/check
  ............................................
  ┌─────────────────────────────────────────────────────┐
  │  POST /auth/start                                   │
  │  { "checkToken": "eyJ...", "channel": "PHONE" }     │
  └──────────────────────┬──────────────────────────────┘
                         │
                         ▼
           Phone extracted from checkToken
           Partial account created
           OTP sent via SMS
           tempToken issued
                         │
                         ▼
  ┌─────────────────────────────────────────────────────┐
  │  POST /auth/verify                                  │
  │  { "tempToken": "eyJ...", "otp": "123456" }         │
  └──────────────────────┬──────────────────────────────┘
                         │
                         ▼
            Phone verified
            Primary incomplete
            ONBOARDING TOKEN issued
            App locked to primary screens
                         │
              ┌──────────┴──────────┐
              ▼                     ▼
    POST /auth/             POST /auth/
    onboarding/name         onboarding/age
    { firstName,            { birthDate }
      lastName }                  │
          │                       ▼
          ▼               Under 13? → BLOCKED
    New onboarding          13-17 → RESTRICTED
    token returned          18+   → FULL
    Continue to age               │
                                  ▼
                         PRIMARY COMPLETE
                         ACCESS TOKEN issued
                         Identifier + name + avatar
                         saved to device storage
                         User lands on feed ✓

FLOW 4 — Existing User, Passwordless Login

  action: LOGIN, authMethods.passwordless: true
  User picks OTP option
  ............................................
  ┌─────────────────────────────────────────────────────┐
  │  POST /auth/passwordless/channels                   │
  │  { "checkToken": "eyJ..." }                         │
  └──────────────────────┬──────────────────────────────┘
                         │
                         ▼
           Backend checks account channels
                         │
              ┌──────────┴──────────┐
              │                     │
        ONE CHANNEL          MULTIPLE CHANNELS
        (phone only)         (phone + email)
              │                     │
              ▼                     ▼
       action:              action: SELECT_CHANNEL
       PROCEED_TO_OTP       Show channel picker
       Skip picker           User picks PHONE or EMAIL
              │                     │
              └──────────┬──────────┘
                         ▼
  ┌─────────────────────────────────────────────────────┐
  │  POST /auth/start                                   │
  │  { "checkToken": "eyJ...", "channel": "PHONE" }     │
  │  or { "checkToken": "eyJ...", "channel": "EMAIL" }  │
  └──────────────────────┬──────────────────────────────┘
                         │
                         ▼
           Backend extracts actual phone or email
           internally from account
           Sends OTP to chosen channel
           tempToken issued
                         │
                         ▼
  POST /auth/verify { tempToken, otp }
                         │
                         ▼
            OTP valid. Primary complete.
            ACCESS TOKEN issued.
            Device storage entry updated.
            User lands on feed ✓

FLOW 5 — Existing User, Password Login

  action: LOGIN, authMethods.password: true
  User picks password option
  ............................................
  ┌─────────────────────────────────────────────────────┐
  │  POST /auth/login/password                          │
  │  { "checkToken": "eyJ...", "password": "..." }      │
  └──────────────────────┬──────────────────────────────┘
                         │
                         ▼
           Account found from checkToken
                         │
              ┌──────────┴──────────┐
              NO PASSWORD           HAS PASSWORD
                   │                     │
                   ▼                     ▼
             422              Password verified
             action: USE_OTP  Risk assessed
             availableMethods          │
             returned          ┌───────┴───────┐
                               │               │
                          KNOWN DEVICE   UNKNOWN DEVICE
                               │               │
                               ▼               ▼
                        ACCESS TOKEN    Device OTP sent
                        issued          Verify device
                        directly        ACCESS TOKEN issued

  action: LOGIN, authMethods.google: true
  User picks Google
  ............................................
  ┌─────────────────────────────────────────────────────┐
  │  POST /auth/login/oauth                             │
  │  { "checkToken": "eyJ...",                          │
  │    "provider": "GOOGLE", "code": "..." }            │
  └──────────────────────┬──────────────────────────────┘
                         │
                         ▼
           Account found from checkToken
           Google linked to account?
                         │
              ┌──────────┴──────────┐
              NO                   YES
              │                     │
              ▼                     ▼
        422               Google identity confirmed
        action: USE_OTP   Profile data pre-filled
        availableMethods  from Google
        returned                   │
                          Primary complete?
                          ┌────────┴────────┐
                          NO               YES
                          │                 │
                          ▼                 ▼
                  ONBOARDING TOKEN   ACCESS TOKEN
                  collect age        issued ✓

FLOW 7 — Forgot Password

  Only shown when authMethods.password: true
  ............................................
  ┌─────────────────────────────────────────────────────┐
  │  POST /auth/password/forgot/initiate                │
  │  { "checkToken": "eyJ..." }                         │
  └──────────────────────┬──────────────────────────────┘
                         │
                         ▼
           Account has password?
              │
   ┌──────────┴──────────┐
   NO                   YES
   │                     │
   ▼                     ▼
  422               OTP sent to phone
  action: USE_OTP   tempToken issued
                         │
                         ▼
  POST /auth/password/forgot/verify-otp
  { tempToken, otp }
                         │
                         ▼
              OTP verified
              resetToken issued (10 mins, single use)
                         │
                         ▼
  POST /auth/password/forgot/reset
  { resetToken, newPassword, confirmPassword }
                         │
                         ▼
              Password updated
              All other sessions revoked
              ACCESS TOKEN issued
              User logged in ✓

FLOW 8 — Secondary Onboarding (Progressive)

  User tries to create an event
  Needs: username + email
  username: false ← first missing
  email:    false
  ............................................
  422 from resource guard
  action: COLLECT_USERNAME
  allMissing: ["username", "email"]
  stepsRemaining: 2
  ............................................
  Frontend: "2 steps — Step 1 of 2"

  POST /onboarding/username
  Bearer <accessToken>
  { "username": "joshsakweli" }
          │
          ▼
  Username saved
  New accessToken issued
  action: COLLECT_EMAIL
  stepsRemaining: 1
  ............................................
  Frontend: "Step 2 of 2 — Add email"

  POST /onboarding/email/initiate
  Bearer <accessToken>
  { "email": "josh@qbitspark.com" }
          │
          ▼
  OTP sent to email
  tempToken returned
  nextAction: VERIFY_EMAIL
          │
          ▼
  POST /onboarding/email/verify
  Bearer <accessToken>
  { "tempToken": "eyJ...", "otp": "123456" }
          │
          ▼
  Email verified
  New accessToken issued
  action: PROCEED
  stepsRemaining: 0
          │
          ▼
  Frontend retries create event
  Passes ✓

FLOW 9 — Wrong Number, Changing During Registration

  User typed wrong number
  OTP sent. User clicks "Change number"
  Before OTP verified — just restart
  ............................................

  POST /auth/check { correct number }
          │
   ┌──────┴──────────────────┐
   │                         │
  NOT IN DB             ALREADY IN DB
   │                         │
   ▼                         ▼
  Fresh               Phone verified?
  registration        ┌──────┴──────┐
  continues           NO            YES
                      │              │
                      ▼              ▼
               Release phone   Primary complete?
               from orphan     ┌──────┴──────┐
               New user        NO            YES
               flow            │              │
                         CONTINUE_     "Number has account.
                         ONBOARDING     Login instead?"
                                            │
                                   ┌────────┴────────┐
                                   LOGIN         DIFFERENT
                                   │              NUMBER
                                   ▼               ▼
                            Login flow        /auth/check
                                              again

FLOW 10 — Returning User, Token Expired

  App opened. Access token expired.
  ............................................
                    │
         ┌──────────┴──────────┐
         │                     │
    HAS PASSWORD          NO PASSWORD
         │                     │
         ▼                     ▼
  Has refresh token?    /auth/check auto-called
  ┌───────┴───────┐     from stored identifier
  YES             NO            │
  │               │             ▼
  ▼               ▼    Passwordless channel check
  Silent       Show    OTP sent to chosen channel
  refresh      login   /auth/verify
  ACCESS       screen  Primary complete → ACCESS TOKEN
  TOKEN                directly, no onboarding shown ✓
  issued ✓

Client-Side Persistent Identity

This is a frontend-only feature. Zero backend changes required.

What Gets Stored on Device

┌────────────────────────────────────────────────────┐
│  Stored after every successful login               │
│                                                    │
│  identifier    →  "+255712345678"                  │
│  maskedPhone   →  "••• ••• ••78"                  │
│  displayName   →  "Joshua Sakweli"                 │
│  avatarUrl     →  "https://..."                    │
│  lastLoginAt   →  "2026-04-01T10:00:00Z"           │
└────────────────────────────────────────────────────┘

NEVER store:
✗  Access tokens
✗  Refresh tokens
✗  Passwords or OTPs
✗  Full unmasked phone number in plain text

Storage Location by Platform

Platform	Storage Method
Android	`EncryptedSharedPreferences` — hardware-backed encryption
iOS	`Keychain` — secure enclave
Web	`localStorage` — for non-sensitive display data only, never tokens

Stored Accounts List Rules

Maximum 5 accounts stored per device
Sorted by lastLoginAt — most recently used first
Updated after every successful login (name, avatar may change)
If 6th account added → prompt user to remove one first

UI Screens (Dotted)

Screen 1 — App Open, One Stored Account

  ┌ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ┐

        [NextGate Logo]

        ┌─────────────────────┐
        │    [  Avatar  ]     │
        │   Joshua Sakweli    │
        │   ••• ••• ••78     │
        └─────────────────────┘

        ┌─────────────────────┐
        │   Continue with OTP │  ← primary option
        └─────────────────────┘
        ┌─────────────────────┐
        │   Use Password      │  ← only if password set
        └─────────────────────┘
        ┌─────────────────────┐
        │   G  Continue with  │  ← only if google linked
        │      Google         │
        └─────────────────────┘

        Not you?  Sign in with a different account

  └ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ┘

Screen 2 — Account Picker (Multiple Stored Accounts)

  ┌ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ┐

        [NextGate Logo]
        Choose an account

        ┌─────────────────────────┐
        │ [Av]  Joshua Sakweli   →│  ← tap to login
        │       ••• ••• ••78     │
        │       2 mins ago        │
        ├─────────────────────────┤
        │ [Av]  QBIT SPARK       →│
        │       ••• ••• ••32     │
        │       3 days ago        │
        ├─────────────────────────┤
        │  +   Add another account│
        └─────────────────────────┘

        Long press an account to remove it

  └ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ┘

Screen 3 — Remove Account Confirmation

  ┌ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ┐

        Remove account from
        this device?

        ┌─────────────────────┐
        │ [Av]  Joshua Sakweli│
        │       ••• ••• ••78 │
        └─────────────────────┘

        This only removes the account
        from this device. Your NextGate
        account will not be deleted.

        ┌─────────────────────┐
        │      Remove         │
        └─────────────────────┘
        ┌─────────────────────┐
        │      Cancel         │
        └─────────────────────┘

  └ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ┘

Screen 4 — Fresh Phone Entry (No Stored Account)

  ┌ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ┐

        [NextGate Logo]

        Enter your phone number
        to get started

        ┌──────┐ ┌───────────────┐
        │ +255 │ │  7XX XXX XXX  │
        └──────┘ └───────────────┘

        ┌─────────────────────┐
        │      Continue       │
        └─────────────────────┘

        By continuing you agree to our
        Terms of Service and Privacy Policy

  └ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ┘

Screen 5 — OTP Channel Picker

  ┌ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ┐

        Where should we send
        your code?

        ┌─────────────────────────┐
        │ 📱  SMS to              │
        │     ••• ••• ••78       │  ← tap to choose
        └─────────────────────────┘
        ┌─────────────────────────┐
        │ ✉️   Email to           │
        │     j••••@g••••.com    │  ← tap to choose
        └─────────────────────────┘

  └ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ┘

Screen 6 — OTP Entry

  ┌ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ┐

        Enter the 6-digit code
        sent to ••• ••• ••78

        ┌───┐ ┌───┐ ┌───┐ ┌───┐ ┌───┐ ┌───┐
        │ 1 │ │ 2 │ │ 3 │ │   │ │   │ │   │
        └───┘ └───┘ └───┘ └───┘ └───┘ └───┘

        Code expires in  01:47

        Resend code  (available in 0:13)

        Wrong number? Change it

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Screen 7 — Primary Onboarding, Name Step

  ┌ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ┐

        ● ○                   Step 1 of 2

        What is your name?

        ┌─────────────────────────┐
        │  First name             │
        └─────────────────────────┘
        ┌─────────────────────────┐
        │  Last name              │
        └─────────────────────────┘

        ┌─────────────────────┐
        │      Continue       │
        └─────────────────────┘

        This is how you will appear
        on NextGate

  └ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ┘

Screen 8 — Primary Onboarding, Age Step

  ┌ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ┐

        ● ●                   Step 2 of 2

        When were you born?

        ┌──────────────────────────┐
        │  DD  /  MM  /  YYYY      │
        └──────────────────────────┘

        ┌─────────────────────┐
        │      Continue       │
        └─────────────────────┘

        Your age helps us show you
        the right content.
        We never share your birthday.

  └ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ┘

Screen 9 — Secondary Onboarding Gate (Inline, Not Full Screen)

  ┌ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ┐

        ╔═════════════════════════╗
        ║  Choose a username      ║
        ║  to create events       ║
        ║                         ║
        ║  Step 1 of 2            ║
        ║  ──────────────         ║
        ║                         ║
        ║  ┌─────────────────┐   ║
        ║  │  @username      │   ║
        ║  └─────────────────┘   ║
        ║                         ║
        ║  ┌─────────────────┐   ║
        ║  │    Continue     │   ║
        ║  └─────────────────┘   ║
        ║                         ║
        ║  Maybe later            ║  ← dismisses modal
        ╚═════════════════════════╝   user stays on feed

  └ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ┘

Secondary onboarding appears as a bottom sheet or modal, not a full page. User can dismiss it and continue browsing. They will be prompted again when they try the same action.

Screen 10 — Forgot Password

  ┌ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ┐

        Forgot your password?

        We will send a reset code to
        your phone number.

        ┌─────────────────────┐
        │   Send reset code   │
        └─────────────────────┘

        ┌─────────────────────┐
        │   Login with OTP    │  ← always available
        └─────────────────────┘

        Code will be sent to
        ••• ••• ••78

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Endpoint Reference

Public — No Auth Required

Method	Endpoint	Send	Receive
POST	`/auth/check`	`{ identifier }`	checkToken + exists + authMethods
POST	`/auth/passwordless/channels`	`{ checkToken }`	available channels masked
POST	`/auth/start`	`{ checkToken, channel }`	tempToken
POST	`/auth/verify`	`{ tempToken, otp }`	onboardingToken or accessToken
POST	`/auth/login/password`	`{ checkToken, password }`	accessToken or device flow
POST	`/auth/login/oauth`	`{ checkToken, provider, code }`	accessToken or onboardingToken
POST	`/auth/resend-otp`	`{ tempToken }`	new tempToken
POST	`/auth/device/verify`	`{ deviceVerificationToken, otp }`	accessToken
POST	`/auth/password/forgot/initiate`	`{ checkToken }`	tempToken
POST	`/auth/password/forgot/verify-otp`	`{ tempToken, otp }`	resetToken
POST	`/auth/password/forgot/reset`	`{ resetToken, newPassword, confirmPassword }`	accessToken

Primary Onboarding — Onboarding Token Required

Method	Endpoint	Send	Receive
POST	`/auth/onboarding/name`	`{ onboardingToken, firstName, lastName }`	new onboardingToken
POST	`/auth/onboarding/age`	`{ onboardingToken, birthDate }`	accessToken

Secondary Onboarding — Access Token Required

Method	Endpoint	Send	Receive
POST	`/onboarding/username`	`{ username }`	new accessToken + next action
POST	`/onboarding/bio`	`{ bio }`	new accessToken + next action
POST	`/onboarding/interests`	`{ interestIds[] }`	new accessToken + next action
POST	`/onboarding/profile-pic`	multipart image	new accessToken + next action
POST	`/onboarding/email/initiate`	`{ email }`	tempToken + nextAction
POST	`/onboarding/email/verify`	`{ tempToken, otp }`	new accessToken + next action

Session Management — Access Token Required

Method	Endpoint	Send	Receive
POST	`/auth/token/refresh`	`{ refreshToken }`	new accessToken + refreshToken
POST	`/auth/token/revoke`	`{ refreshToken }`	success
POST	`/auth/sessions/sign-out`	—	success
GET	`/auth/sessions`	—	active sessions list
DELETE	`/auth/sessions/{id}`	—	success

Client-Side Storage Specification

Storage Keys

ng_stored_accounts    →  JSON array of stored account objects
ng_active_identifier  →  identifier of currently active session

Stored Account Object

{
  "identifier": "+255712345678",
  "maskedPhone": "••• ••• ••78",
  "displayName": "Joshua Sakweli",
  "avatarUrl": "https://cdn.nextgate.app/avatars/...",
  "lastLoginAt": "2026-04-01T10:00:00Z"
}

Account Management Rules

Action	What Happens
Successful login	Add or update entry in stored list. Update lastLoginAt, name, avatar.
Normal logout	Keep entry in stored list. User sees welcome back on next visit.
"Forget this device" logout	Remove entry from stored list. Clean phone entry shown next visit.
Remove from picker	Remove entry from stored list. Account still exists on server.
Add another account	Login flow, auto-added to list on success.
6th account added	Prompt user to remove one existing entry first.
Account deleted on server	Remove entry from stored list automatically after next failed check.

What to Update After Successful Login

After ACCESS TOKEN received:
  → Update displayName from onboarding flags if changed
  → Update avatarUrl if changed
  → Update lastLoginAt to now
  → Sort stored list by lastLoginAt descending

What Changes vs What Stays

Being Removed

Single linear OnboardingStep tracking → replaced by independent flags
onboardingStep database column → database migration required
isOnboardingComplete() → replaced by isPrimaryComplete()
Onboarding token for secondary steps → access token handles all of that now
refreshOnboardingToken endpoint → no longer needed
Email and username as login identifiers → phone only from now on
Raw identifier passed to /auth/start → replaced by checkToken + channel

Being Added

POST /auth/check — new entry point
POST /auth/passwordless/channels — new channel check endpoint
OnboardingFlagResolver — derives all flags from existing account data
Resource guard — checks flags, returns next action automatically
checkToken generation in JWT system
channel field on /auth/start
All secondary onboarding endpoints
action and context on all responses
Client-side persistent identity (frontend only, zero backend changes)

Staying Exactly as They Are

All OTP generation, validation, and rate limiting
Session creation and management
Device trust and registration
Risk assessment and scoring
Account blocking for underage users and fraud
Password change and management
Email and phone account linking (post-login)
JWT signing infrastructure
Security filter chain — minor flag reading addition only

Security Notes

/auth/check rate limited — max 10 per IP per minute, max 3 per phone per hour
checkToken single-use — consumed the moment any auth action is taken
checkToken cryptographically binds the phone to every action — identifier cannot be swapped mid-flow
Frontend never passes raw email or phone after /auth/check — channel type enum only
Orphaned partial accounts cleaned up automatically every night
Phone collision with verified account — redirected to login, cannot overwrite
Phone collision with unverified account — released and reassigned via OTP proof
Primary onboarding — no cancel, no skip, app stays locked until all three steps done
Underage — account deleted immediately, phone blocklisted, cannot return until 13th birthday
Forgot password link — never shown unless authMethods.password: true
Wrong auth method — backend validates before doing anything, 422 returned immediately
Stored accounts on device — only display data stored, never tokens or passwords
"Forget this device" — clears stored identifier, forces fresh phone entry next visit