Integrating the Fidel iOS SDK into a Swift iOS application allows businesses to receive real-time transaction notifications from customers who opt-in with their card numbers, providing valuable insights into consumer shopping behavior. The SDK ensures PCI compliance, safeguarding sensitive financial information by handling card details securely. The process involves setting up a Swift app in Xcode, importing the Fidel Cocoapod, and configuring the SDK with necessary details like the company name, privacy URL, and program identifiers. The SDK's OCR tool requires enabling camera permissions for reading card numbers. Once implemented, the SDK facilitates easy card linking, enabling users to participate in real-time transaction programs seamlessly, while developers can monitor linked cards through the Fidel dashboard.