Few things sink an e-commerce business faster than a broken payment gateway. When customers try to complete a purchase, only to be stopped by a red banner that says "There was an error processing your order. Please try again or contact us for assist...

  Table of Contents 1. Quick Executive Summary 2. 30 Days Before Launch: Lay Your Technical Foundation 3. 15 Days Before Launch: Content & Legal Compliance Audit 4. 7 Days Before Launch: Functionality & User Experience Tes...