Guides

Setup guides

Each guide starts from nothing and ends with a test on your own phone or inbox: the Firebase and Apple keys, the files to host, the DNS records, the code in your app and on your server. For every field and error, see the API reference.

Not sure where to start

Find the job, then follow its guide. Which product to use, and when has the full list, recipes for common apps and the order to set things up.

The job	Use	Guide
Confirm an email at sign-up	Email OTP	Open
Sign in without a password	Passkeys, with an email code as the fallback	Open
A second step after the password	Passkeys or the authenticator app	Open
Approve a sign-in on a new computer	Approve	Open
Confirm a payment or a password change	Approve or passkeys	Open
Order updates, reminders and offers	Push	Open

Push notifications

8 min readSet up push on AndroidFrom a new Firebase project to a push on your Android phone: google-services.json, the service account key, the device token, and a first send.9 min readSet up push on iOSHow to make an APNs .p8 key, find the Key ID, Team ID and bundle id, turn on push in Xcode, get the device token and send a first push.6 min readSet up web pushWeb push with keys SignOps makes for you: a service worker, the permission prompt, the subscription on your server, and iPhone home screen apps.6 min readSet up push in React Native, Expo and FlutterUse the Firebase messaging package your framework already has, register the token with SignOps, and send to Android and iOS from one call.

Approve a sign-in on a trusted phone

8 min readSet up ApproveLet users approve a sign-in or a payment on a phone they already use: enrol the phone after login, ask it from your server, and show the number to match.

Passkeys

7 min readSet up passkeys on your websiteYour domain, the sign-in page origins, a registration token from your server, the browser prompt and the check before a session starts.8 min readSet up passkeys in your Android and iOS appsFind the SHA-256 of your signing certificate, the Team ID and bundle id, host assetlinks.json and apple-app-site-association, and add Associated Domains.

Authenticator app codes

7 min readSet up authenticator app codesA two-step settings page with a QR code, backup codes shown once, the code check at sign-in, a lost phone, the lock, and how to test it on your phone.

Email codes and magic links

8 min readSet up email OTP and magic linksTest with your own address first, then add your domain and its DNS records, send and check codes, and switch to sign-in links if you prefer.

Send your first push today.

Free for 1,000 push devices, 100 approvals and 1,000 passkey sign-ins a month, and 500 email codes to try. No card until you pass a free amount.

Get API key Read the quickstart