I try to used my card , but the transctions are declined, it’s ok for this purchased , but I don’t want to have problems when I used my card , Apple always (declined the transaction)

Just to be clear, are you referring to the AppleCard Mastercard credit card ?

If so, you’ll need to contact Goldman Sachs thru your Wallet to determine why any specific transaction was “declined.”

For any other credit card “declines” you’ll need to contact the specific card’s issuer.

FYI, once any debit or credit card is “installed” in your Wallet … Apple has no part in completing purchase transactions.

It’s all accomplished by your device, your bank, the merchant, and the payment network (e.g. Visa, Matercard, AmEx, etc.)