WEX requires merchants to send purchase authorizations to WEX for approval/decline. However, when the merchant cannot connect to the WEX host, the merchant should use the purchase restrictions on the card to determine if the products are permitted for purchase.
The terminal should not add products between the preauthorization and completion (the exception is car wash). If WEX hasn’t authorized it, it should not be sold. (This changes if the POS supports DE 62 Available Products in which case they can add items following the processing rules of Available Products.)
If the terminal supports store and forward and is processing a transaction when it cannot reach WEX, then it should limit the items purchased as follows:
- Magstripe is limited to the two digit purchase restriction on the magstripe (Sections 3.1.1 and 3.1.4 of the WEX Spec)