As far as the actual cart communicating to your e-Path payment page, you simply need to have the cart send the following field names with values to your payment page...
ord = A unique order number
for = What the customer is buying or the merchants official name
amt = The amount the customer is paying
ret = A return URL which will be provided by the cart. This enables the customer to return to the cart so the cart closes off the order.
If you think it sounds too simple, well, that's because it just is. There is nothing more, no response codes, no further action from e-Path, nothing.
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