I cannot buy gems or game packages

If u ever encounter such issues, pls follow the instructions:
pay error 3：check the payment configuration as what indicates in this link:
https://support.google.com/googleplay/answer/9037938?hl=en

pay error 6：the account is not safe, pls change to another google play account

Pay error 7：Clear data of google play:
https://support.google.com/googleplay/answer/7513003?hl=en&visit_id=637284104073170608-2210111938&rd=1

Pay error 9：check the payment configuration
https://support.google.com/googleplay/answer/9037938?hl=en