You can use the api of nostr:npub1getal6ykt05fsz5nqu4uld09nfj3y3qxmv8crys4aeut53unfvlqr80nfm wallet as an easy starting point.

https://guides.getalby.com/alby-wallet-api/reference/getting-started

I'm using it in Britt and it's easy to implement.