Tira here, from Shopify Support.
It sounds like you want to pay for your domain on your store, and are receiving an error. If you are, could you take a screenshot of the error you're seeing so that I can take a further look?
Sometimes cards can be declined because they aren't meeting the requirements needed to process payments on Shopify. Please confirm the following:
- Your card can take recurring payments online in USD
- Your bank allows your card to take payments online
- It is a valid VISA, MasterCard or AMEX card
- The card has appropriate funds available
- The billing address and details are the same as what your bank has on file
- There are no restrictions on the card on how much your bank will allow to be processed at once
Thank you for your help. Once I have this information from you, I can provide you with further guidance and suggestions.