1 PCI Question for Payflow Pro 1 Trey Hendon III posted 9 Years Ago I'm working through PCI Compliance for Rock using Payflow Pro's prefrerred provider (Panoptic Security). One of the questions asks for technical details related to how my company's website communicates with the gateway. The two options are: My company's website software/shopping cart application communicates directly with my gateway or processor using a silent order post, direct post or javascript method to authorize the transaction. My company's website software/shopping cart application passes the transaction data via an Application Programming Interface (API) or to a separate payment application which in turn communicates with my gateway or processor to authorize the transaction. I'd assume Rock is using the second option (API based), but was hoping to get an official answer here (for me and others searching in the future).