Build Crypto 2D Website Gateway

I’m looking to equip my website with a 2-D International payment gateway that charges customers in fiat but settles every successful one-time transaction directly to my Bitcoin wallet. The flow is simple: card is captured → funds are converted through a reputable exchange API → the equivalent BTC lands in my address, all within the same transaction window.

Key points I care about
• Only one-time payments are required; no subscription or recurring logic.
• Website integration only—no mobile app for now.
• PCI-DSS–compliant card handling and secure tokenisation are non-negotiable.
• Automatic BTC conversion/settlement must be verifiable on-chain, with a webhook that pings my server the moment coins are sent.
• A concise JavaScript (or HTML) snippet should drop into my checkout page and fire against your back-end REST endpoints.
• An admin panel or at least clear API routes to view logs, issue refunds, and handle chargebacks.
• Well-commented code, environment variable template, and a step-by-step deployment guide so I can spin this up on a typical Linux VPS.

Deliverables
1. Back-end service (language/framework of your choice) that handles card tokenisation, payment intent creation, fiat-to-BTC conversion, and settlement.
2. Front-end integration snippet with examples of success, failure, and pending states.
3. Webhook module that confirms on-chain BTC transfer and updates order status.
4. Configurable settings for exchange API keys, wallet address, and network fees.
5. Testing scripts or Postman collection proving end-to-end one-time payment flow.
6. Documentation covering setup, environment variables, and troubleshooting.

I’ll validate everything first in a sandbox, then switch to live keys and my production wallet. Please share your preferred tech stack, any past experience with Bitcoin payment flows, and an estimated timeline so we can move forward quickly.