Expresso Store: Return page from payment gateway error: form has expired

Question

I'm using a custom gateway (offsite) for exp-resso store; upon successful transaction the return page gives out "This form has expired. Please refresh and try again."

The transaction is captured albeit not completed.

I'm using the default store_example templates.

Edit: EE ver 2.9.3; Exp-resso 2.5.0

Answer 1

Are you using the "return" parameter?

{exp:store:checkout return="order/ORDER_HASH"}
    <input type="submit" name="submit" value="Place Order" />
{/exp:store:checkout}