The "Validation" return URL is the address of the page on your site to which your customers are sent after choosing their delivery method on the delivery method selection page.
This URL directs them, for example, to the basket summary or payment page.
The "Failed" return URL is the address of the page on your site that your customers are returned to if the page call fails (i.e. they were unable to access the delivery method selection page and choose a delivery method).
This can happen, for example, when some of the call parameters are incorrect, in which case an error code is sent to you by the application.
This page should allow your customer to finalise their order via an alternative delivery method.
In order to avoid any risk of losing the order, Colissimo request the shipper to send also in its parameters for calling the "Failure" return URL just in case the information in the back office cannot be accessed.
For more information on the call parameters, please refer to the integration guide of the Delivery method selection page.
