Add Google reCAPTCHA to Mobile login page

I need Google’s reCAPTCHA v2 wired into the registration flow of my mobile app to block automated account creation. When a new user presses “Sign Up,” the challenge should appear, return its token, and let the server validate it before any account is written... (Budget: ₹600 - ₹1500 INR, Jobs: Backend Development, Mobile App Development, React Native)