I've been waiting since December for my payment to the Apple Developer Program to be processed by Apple. I have not received any assistance from Apple, only excuses why their support is so slow and that I should try paying using the Apple Developer App. I think I finally figured out why Apple is not processing the payment, it is because the payment is being initiated via Credit Card from a Windows PC. I luckily have a friend who has an iPhone so I will attempt to make payment using an iPhone, installing the Apple Developer App and adding my credit card as a payment option. If this succeeds I will let you all know. Wish me luck!