PrestaShop SumUp Payment Integration

I’m running PrestaShop 1.8 and want to accept payments through SumUp even though no official module exists. I need someone who has already wired SumUp into PrestaShop before and can replicate the setup quickly and cleanly.

Here’s what I expect:
• Build or adapt a custom SumUp gateway that drops seamlessly into my PrestaShop 1.8 checkout.
• Make sure payments flow through Order Management, update Customer Accounts with transaction details, and complete the Checkout Process without errors.
• Provide clear installation steps so I can re-deploy the module on staging or future upgrades.
• Test end-to-end—from card entry in the SumUp web SDK to confirmed order status inside the back office—with no other payment systems present.

I already have SumUp merchant credentials ready; you bring the proven know-how. If you’ve done this before, share a link or brief summary of your previous PrestaShop-SumUp work when you respond.