Confusion with Microsoft Voucher. Any help

Hi,
I received and email from Microsoft for taking a free MCSE Cloud, i got the voucher number from them.
it Says " This VOUCHER number is only valid for set of exams - 417, 246 and 247. "
I followed the procdure as described in email which is below.
1. Visit www.prometric.com/microsoft and click the "Start" button
2. Follow the onscreen prompts to schedule your appointment including selection of your country, exam, testing center, and exam date. Note: You will be required to log in at a point in the process.
3. On Payment Information Screen, click button to enter your Voucher Number.
4. Once validated, continue through the process to pay for your exam. Please note: you will pay full price for the full exam pack at the time of registering. Retain your voucher number as it will be required for all future registrations completed for your pack 5. You will receive a confirmation screen along with an email upon successful registration.
When ready to schedule your remaining exams including free retakes, follow the same steps above; however, payment information will not be required.
But after the voucher is verified there is still an option for providing my Card i don't understand if its free why take the money or is it only for the first exam. If anybody explain this i will be really thank full.
I received and email from Microsoft for taking a free MCSE Cloud, i got the voucher number from them.
it Says " This VOUCHER number is only valid for set of exams - 417, 246 and 247. "
I followed the procdure as described in email which is below.
1. Visit www.prometric.com/microsoft and click the "Start" button
2. Follow the onscreen prompts to schedule your appointment including selection of your country, exam, testing center, and exam date. Note: You will be required to log in at a point in the process.
3. On Payment Information Screen, click button to enter your Voucher Number.
4. Once validated, continue through the process to pay for your exam. Please note: you will pay full price for the full exam pack at the time of registering. Retain your voucher number as it will be required for all future registrations completed for your pack 5. You will receive a confirmation screen along with an email upon successful registration.
When ready to schedule your remaining exams including free retakes, follow the same steps above; however, payment information will not be required.
But after the voucher is verified there is still an option for providing my Card i don't understand if its free why take the money or is it only for the first exam. If anybody explain this i will be really thank full.
Comments
Thanks for the reply