What is the difference between a linked and unlinked Credit?
A linked Credit is a Credit transaction submitted against a Charge transaction that was originally processed through Authorize.Net. By default, all payment gateway accounts require that Credit transactions be submitted with the transaction ID (x_trans_id) of the original Charge transaction, be less than the original Charge amount, and that the original transaction be less than 120 days old. An unlinked credit is not linked to a previous Charge transaction processed through Authorize.Net, and has no date or amount restrictions. In order to process unlinked Credits, merchants must apply for Expanded Credit Capabilities (ECC) by completing and submitting the ECC Application to Authorize.Net.
A linked credit is a refund transaction submitted against a charge transaction that was originally processed through the payment gateway. By default, all payment gateway accounts require that credit transactions be submitted with the transaction ID of the original charge transaction, be less than the original charge amount, and that the original transaction be less than 120 days old. An unlinked credit is not linked to a previous charge transaction processed through the payment gateway and has no date or amount restrictions. In order to process unlinked credits, you must apply for Expanded Credit Capabilities (ECC) by submitting the Request for ECC Form.