SMS OTP Authentication Module

I’m building an Android application that must verify users through SMS-based one-time passwords. I already have the UI in place; what I need is a clean, reusable module that will: • Trigger an SMS-OTP request via a lightweight REST API you create (any language or framework you’re comfortable with)... (Budget: ₹1500 - ₹12500 INR, Jobs: Android, API Development, Java, Kotlin, Mobile App Development, REST API, Software Architecture, Software Development)