Payment method with direct debit via fax The various fields have the following meanings: Table 32: Parameters for the payment method Direct debit via fax Field name Description Field type Example Fax form Document with the form which the customer must download, fill out, and fax to the merchant. Either enter the name of the file with its path directly or click Browse to search for the file. Entry field, alphanumeric FaxForm_en.pdf (Delete) Delete document Button Save your entries by clicking Save.