android - How to POST raw whole JSON in the body of a Retrofit request? - Stack Overflow
Sending Data With Retrofit 2 HTTP Client for Android
Basic and advanced networking in Dart and Flutter — the Tide way. Part 5: REST API requests with retrofit. Basic. | by Anna (Domashych) Leushchenko 👩💻💙📱🇺🇦 | Tide Engineering Team | Medium