Required Legal Certificates To Become A Third-Party Payment Provider?

My associate has his own payment system and we would like to public it to other merchants. I have read the articles Requirements for payments extensions, it was not specific on how Shopify will review our payment system in terms of what types of legal documents and certifications we need to send to Shopify

Hi @Peach

If this some kind of payment system via application that you would like to upload in Shopify app store? or just like payment methods directly to Shopify settings?

It’s a payment method directly to Shopify settings