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WorkOS
The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
In the app I'm building, we use react-native-keychain. At its core it's meant to use with authentication, which we DO to store oauth tokens, but I also use it as a "re-entry" into the app after it's been put in background or inactive mode. It's the easiest implementation of biometric auth I've found for RN, and it has the ability to fallback to passcode should they fail biometric. Let me know if you have any questions, happy to help!
Try this library : https://github.com/smallcase/react-native-simple-biometrics
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