[martinkivi]

When you are saying that you want to own the entire checkout experience, what exactly do you mean? Do you want to own everything related to processing credit card payments, including card data storage etc? It would also good to specify where your company is located.

We've had good experiences with Braintree, Adyen, Stripe and multiple other payment services for our customers at Shoperb (www.shoperb.com. It does sound like the problem you are facing may be technical implementation related. Have you done a custom implementation or using what Stripe provides out of the box?