Payment Platform recommendations for publishing F2P/IAP game direct to Windows?

Hi UE4 community! I’m working with a small team to publish a product for architects built in UE4. We want to capture users’ credit card info upon installation, and offer various services and add-ons for small in-app purchases. We are self-publishing directly to Windows, no Steam/Epic/App/Play Stores. Has anyone integrated with their own payment processor and recommend the experience? Endless thanks for your help and input!