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To add passwordless phone login in Laravel, send an OTP from your server, verify the code, then authenticate the matching Laravel user and establish a session. Sending an SMS alone does not log anyone in. This guide lays out that complete flow and a feature-test plan; it deliberately leaves the Fast2SMS verification payload to the provider’s current reference because its exact fields and response contract need confirmation.
How the login flow fits together
Keep OTP delivery, OTP verification, and Laravel authentication as distinct steps. The provider handles sending (and, depending on the verification flow you implement, may handle checking) the code. Your application decides which user a verified phone number represents and then creates the authenticated session.
- Request a code: validate the submitted phone number, apply throttling, and call Fast2SMS from the server.
- Verify the code: submit the user’s code using the current Fast2SMS verification contract, and accept only a confirmed success response.
- Resolve the user: find an account for that verified number, or provision one only if your registration policy allows it.
- Log in: authenticate the resolved user using Laravel’s session-based authentication, regenerate the session identifier, and redirect or return the appropriate response.
Decide explicitly whether unknown numbers may register, whether users can opt into a persistent “remember me” session, and what happens when an account is disabled. Do not treat possession of an unverified phone number as proof of identity.
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The official Fast2SMS send reference specifies POST https://www.fast2sms.com/dev/otp/send. It requires the API key in the Authorization header, a 10-digit Indian mobile number in mobile, and an OTP template ID in otp_id. Fast2SMS documents optional expiry from 1 to 10080 minutes (default 15) and OTP length from 4 to 10 digits (default 6); these are API-supported bounds and defaults, not security recommendations. See the Fast2SMS OTP send API reference for its current request contract.
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Keep the key out of JavaScript, HTML, source control, and client responses. Store it in a server-side environment setting and expose it to application code through Laravel configuration. For example, add the setting to your environment and config file, then read it through config(); do not call environment helpers throughout application code. The exact configuration file and deployment secret-management process depend on your Laravel application.
Fast2SMS documents response categories of HTTP 200 for a sent OTP, 400 for validation or logic errors, and 401 for a missing or invalid authorization key. Treat those as provider outcomes, not as proof that the user received or successfully verified a code. The API reference is the authority for the current shape of response bodies.
Implement the send-code endpoint
Validate and normalize the phone number before contacting the provider. The documented send contract is for a 10-digit Indian mobile number; do not silently accept international formats as if the same endpoint contract covered them. Use Laravel validation appropriate to the phone-number policy of your application, and reject malformed input without making an outbound request.
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Put the provider call in a small service so controllers can focus on validation and application behavior. Laravel’s HTTP client supports request headers, timeouts, and response inspection. A simplified shape is:
$response = Http::withHeaders([
'Authorization' => config('services.fast2sms.key'),
])->timeout(10)
->post('https://www.fast2sms.com/dev/otp/send', [
'mobile' => $mobile,
'otp_id' => config('services.fast2sms.otp_id'),
]);Use the exact request fields and encoding shown in the current provider reference; the snippet illustrates server-side placement and is not a substitute for checking the live contract. Laravel’s HTTP client documentation explains timeouts and request behavior: Laravel HTTP Client. Laravel 10.x is the version documented at that URL; check the documentation matching your project’s Laravel version before adopting version-specific syntax.
Handle distinct failure cases instead of returning “code sent” for every outcome:
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- Invalid input: return a validation response and make no provider call.
- Provider rejection: translate provider validation or authorization failures into a safe application error. Do not reveal the API key or raw sensitive provider details to the client.
- Timeout or connection failure: catch the HTTP client’s connection exception and return a retryable error. A timeout does not prove the SMS was not sent, so an automatic retry can create duplicate messages.
- Success response: report that the request was accepted for sending, not that delivery or login is complete.
Never log API credentials or OTP values. Log a request identifier and sanitized error category if operational diagnostics are needed.
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Verify the OTP, then create the Laravel session
Use Fast2SMS’s direct verification reference for the current verification endpoint, request fields, and success and failure response semantics: Fast2SMS OTP verification reference. Those details must be confirmed against the live contract before implementing the call; guessing field names or treating any HTTP 200 response as a valid code can bypass verification.
After the provider confirms the code, resolve the account using the verified phone number—not a separate, unverified value supplied by the browser. If the account exists and is eligible to sign in, authenticate that user through Laravel’s session-based authentication services. Regenerate the session ID after authentication to prevent session fixation. If the number has no eligible account, follow the policy you established: reject sign-in, or create an account through a controlled registration path. Do not silently create accounts unless that is an intentional product decision.
Keep incorrect and expired codes as explicit failure branches. Return a generic verification error that does not disclose whether a phone number has an account. Enforce attempt limits on verification as well as send requests, and define resend behavior so a new code cannot be used to bypass the attempt limit or invalidate a still-active challenge unexpectedly.
Protect sending, verification, and resend behavior
Rate-limit code requests by more than one useful dimension, such as phone number and source IP, and cap repeated verification attempts. Choose limits and lockout behavior based on your application’s risk and user experience; the API’s expiry and length defaults are not a substitute for an abuse policy. Consider adding a short resend cooldown, and make clear to users when a new request may replace or invalidate an earlier code.
Fast2SMS’s help material says Indian business SMS uses DLT registration. This is vendor guidance, not a complete statement of applicable legal or operator requirements. Confirm current requirements for your organization, message templates, and destination with the relevant provider and authorities before launch. Provider setup and regulatory conditions can change.
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Use Laravel’s HTTP fake facilities in feature tests so ordinary test runs do not contact Fast2SMS. Assert both the outbound provider request and the resulting application state. Laravel documents HTTP fakes, request assertions, and test helpers in its HTTP Tests documentation; its authentication documentation covers session-based authentication and manual authentication flows at Laravel Authentication. These links describe Laravel 13.x; use the matching documentation for the version your app runs.
A robust feature suite should cover these branches:
- Malformed or missing phone input is rejected and makes no HTTP request.
- A valid send request calls the expected provider endpoint with the configured authorization header, mobile number, and template ID.
- A provider rejection returns a safe error and does not claim the code was sent.
- A timeout or connection exception returns a controlled retryable response without leaking credentials or code values.
- A correct verified code authenticates the intended user and leaves the session authenticated.
- A wrong or expired code does not authenticate anyone.
- Resend cooldowns, repeated-code requests, and attempt limits behave according to the application’s policy.
- Unknown phone numbers follow the chosen registration policy, and ineligible accounts cannot sign in.
For verification tests, fake the provider’s documented success and failure responses only after checking the current verify contract. Assert that a failed response cannot create an authenticated session. Use Laravel’s session and authentication assertions for the session outcome, and request assertions for the outbound call. Avoid tests that merely assert a success flash message while skipping the authentication state.
Quick Recap
Release checklist
- API credentials and template configuration are stored server-side and excluded from source control.
- The send and verify request contracts match the current Fast2SMS references.
- Phone validation reflects the documented Indian 10-digit send input.
- Provider errors, network exceptions, incorrect codes, expired codes, throttling, and resend behavior have explicit handling.
- Successful verification resolves the right user, regenerates the session, and authenticates through Laravel.
- Feature tests use HTTP fakes and verify both provider interaction and logged-in state.
- Current SMS setup and applicable DLT/operator requirements have been confirmed before production use.
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