Integratoin Payment gateway with Crypto

I have a casino game that update the payment gateway. I need to integrate crypto wallet and to manage the payment with crypto.
Metamask, Trustwallet, Phantom, TRONwallet and etc
Requirement:
- Build frontend for wallet connection modal
- Crypto wallet connection
- Build smart contract for payment
- API integration
I can share the development version for checking project and will provide final version to candidate.
After checking dev version, candidate can provide the estimationf for completing project and we can discuss more details.
Please share experience for similar job.

Good luck.