You should implement SSL certificate pinning when transferring critical information such as credit card information. IUA has implemented SSL Pinning using AFNetworking to enhance security. You will need to request SSL certificates from a certificate authority, add those certificates to your server, and then bundle them in the CRS-IUA app by rebuilding your project in Xcode.

Note: AFNetworking requires that all certificates to be in DER format with the .cer extension and requires bundling all certificates in the certificate chain in your iOS app.