Exam scheduling payment can be made directly through Pearson VUE with a Visa, American Express or MasterCard debit/credit card. However, if you need assistance or have any questions/concerns about payment options, please contact Pearson VUE Customer Service. Another thing would I recommend is to get in contact with the testing center directly for acceptable payment options as well.
For any additional questions or concerns, please feel free to open a case with Certification & Communities Online Support as Daniel suggested above.
Cisco Learning Network Moderator