Paycircle to NEST API - Payment Source allocation

At the minute, if a NEST account has multiple payment sources set up, including expired or inactive sources, there is nothing in place on the Paycircle API to have staff assigned to a certain payment source, resulting in new enrollers being enrolled into the wrong payment source and the pension submission failing.

Seeing as though we can choose which group staff are enrolled into, it would be very useful if we can also select which payment source staff go into