Crypto Payment Gateway Integration for Shopify

We're looking for an experienced developer to integrate a non-custodial crypto payment gateway, Paymento, with Shopify. This integration should allow Shopify merchants to accept crypto payments directly to their own wallets via Paymento API.

What we need:

A Shopify payment app that integrates with an existing Paymento API

Merchants will:

Enter their public wallet keys (XPUB or address) via our dashboard
Configure accepted cryptocurrencies and networks
Receive real-time transaction confirmations from Paymento

Buyers will:

Be redirected to our hosted payment page
See payment instructions and complete the transaction using their wallet
Be redirected back to Shopify order confirmation page after payment
The plugin must support our backend API (RESTful), include signature verification, and webhook for payment status updates

Clean and documented code, compatible with latest Shopify Payment App requirements

What we provide:

API documentation and testnet balance for testing
Shopify Partner account for testing
Technical support and guidance during development

Skills required:

Shopify app development experience (preferably with payments)
Experience integrating external APIs
Understanding of webhooks, REST APIs, and secure transaction flows
Bonus: Experience with crypto wallets or blockchain transactions

Deliverables:

A functional Shopify app (as a custom/private app or public-ready)
Full source code with documentation
Deployment instructions