Abstract: A method for payment transaction handling in a radio communication network is presented. The method is performed in a billing support node. The method includes receiving a payment indication from a third party node of a plurality of predefined third party nodes, generating a cryptographic key by combining a plurality of different identifiers identified in the received payment indication, and checking if the generated cryptographic key is new or already known in the billing support node. When the generated cryptographic key is new the method includes storing a backup of the payment indication in a blockchain, and setting a transaction state of the payment indication to indicate a new transaction. When the generated cryptographic key is already known the method includes rejecting the payment indication. A billing support node, a computer program and a computer program product for payment transaction handling in a radio communication network are also presented.