Within your accounting records, a purchase made by credit card is a credit, just like payments made from any other bank or cash account. You should use a payment form to record the purchase, because that is what you did. The offsetting debit is posted to whatever expense account is appropriate for the purchase. Normally, a credit card is set up as a liability account, so the credit increases its balance. (If you set it up as a contra asset account, the credit will decrease the balance.)
When you pay the card processor after receiving your statement, that includes a credit to your bank account, which decreases its balance, and a debit to the credit card account, moving it back towards zero (assuming you set the card up as a liability account).
That’s basic accounting. But how the bank and/or credit card processor report transactions to you is a completely separate matter. Often, a bank will report from its own perspective, so your payment of the statement (which was a credit to you) is a debit for the bank. But the bank might also think it is being more customer friendly by reversing the signs. You have no control over that and must exercise caution when importing statements to be sure the transactions match the conventions used in your own system.
Whatever you do, do not reverse the use of receipts and payments! Your records must reflect what you did, not how the bank reported. That may mean that for one of your cards you must reverse signs of all transactions before importing the file so things come out correctly in Manager.