post
https://api.intersoftsapient.net/v4/collections/rm/
Schedule a collection of your shipments from a specified location. This endpoint is particularly useful for customers who need to return the parcel and prefer the convenience of having Royal Mail collect the items directly from their address rather than dropping them off at a postal center.
Note: The service used to create the shipment must allow for the shipment to be collected. If no timeslot is sent in the request, then by default, the first available collection date will be selected.
401Unauthorized
403Forbidden
500Internal Server Error
