The authenticity and integrity of the device and the application must be verified to determine whether the application’s backends are communicating with a legitimate application running on an approved/genuine mobile device. An attestation is a technique and process leading to evidence or proof of authenticity.

Check this link to learn more about AppiCrypt, a powerful tool that provides proof of app and device integrity for backends:
https://medium.com/@talsec/mobile-api-anti-abuse-protection-appicrypt-is-a-new-safetynet-and-devicecheck-alternative-20cf7a07dfb0

freeRASP is a Community-driven In-App Protection and User Safety suite. Learn more about security and implement freeRASP into your app! Check the implementation guide at the end of the video.

https://www.youtube.com/watch?v=LLFOSX1c5WA

TL;DR: freeRASP improves the security and ensures the safety of your app. Like Crashlytics but for threats. Flutter, Android and iOS are all supported.

Check this link:
https://medium.com/geekculture/freerasp-in-app-protection-sdk-and-app-security-monitoring-service-de12d8e49400