Payment Issues With Mastercard

Payment processing issues arose between 2Checkout (our payment gateway) and Mastercard, and we were notified that 2Checkout would shut down MasterCard processing for an undefined period.

This means that you may receive “billing attempt failed” errors when trying to renew your Complementary Training subscription.

As such we appreciate it if you:

  • Update your card information if you have an existing Premium and Standard subscription and have used MasterCard for billing. 2Checkout will send you a link for that, and this needs to be done only when you want to use another card. They support Visa, American Express, Discover, and JCB credit cards. To find out how to update your MasterCard, please visit the following link:
  • If you would like to become a member of the Complementary Training and subscribe to any of our plans, please use any of the above credit cards or Paypal to subscribe to the Complementary Training. If you want to use MasterCard anyway, please use the Paypal checkout method on 2Checkout, and link your MasterCard to your Paypal account.

Sadly we have no control over this issue, and like you are hoping that 2Checkout will resolve this issue with MasterCard, and normal operations will resume.

If you require any further information or need our assistance, feel free to contact us at

We thank you for your understanding.

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