an Entity references as follows:
A payment method is a standardized procedure for transferring the monetary amount for a purchase. Payment methods are characterized by the legal and technical structures used, and by the organization or group carrying out the transaction. Commonly used values: http://purl.org/goodrelations/v1#ByBankTransferInAdvance http://purl.org/goodrelations/v1#ByInvoice http://purl.org/goodrelations/v1#Cash http://purl.org/goodrelations/v1#CheckInAdvance http://purl.org/goodrelations/v1#COD http://purl.org/goodrelations/v1#DirectDebit http://purl.org/goodrelations/v1#GoogleCheckout http://purl.org/goodrelations/v1#PayPal http://purl.org/goodrelations/v1#PaySwarm