50 ILCS 345/30
A person who makes a payment by credit card to a local governmental entity shall not be relieved from liability for the underlying obligation except to the extent that the local governmental entity realizes final payment of the underlying obligation in cash or the equivalent. If final payment is not made by the credit card issuer or other guarantor of payment in the credit card transaction, then the underlying obligation shall survive and the local governmental entity shall retain all remedies for enforcement that would have applied if the credit card transaction had not occurred. A person making payment by credit card is not liable for any discount or fee paid to a credit card issuer or other party by a local governmental entity.
50 ILCS 345/30