Integration between kajabi, Zapier, and a Payment gateway or Kajabi -> Payment gateway

I'm trying to link kajabi with "paguelo facil" gateway payment, using Zapier or shopify, but I have a problem with Drip Content in kajabi. Our trainings are delivered through previous payment on a monthly basis. So when a student pays in shopify or "paguelo facil", sometimes all the modules of the course are delivered in one shot. We need to verify first that the payment is done before we release the content. Can you help us with that.