Problems buying a new domain --- Please Help!!

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I am newbie in shopify and I open my store and I try to buy domain name but more than 10 time I have the error
please try again
Please edit account information
All my details it's ok I don't know what I do
and after purchase I receive the billing in my email and your system refund the money to my card
My card work perfectly with any other site or payments

Help me