Allow multiple stamps accounts to be under 1 shipstation account.

[davidtheskier]

We have a client that we are shipping for. We ship all their orders with UPS. When we ship their orders, we want to use the UPS rates from Shipstation, but have all shipments billed directly to them (to their credit card). The way to do this would be to create them their own stamps.com account, connect that stamps account to their store in Shipstation, and have all shipments under that store billed to their account. I can't believe this isn't already a feature in Shipstation. 

[lampinabox]

Same issue. Multiple stamps.com accounts but only one is accessible via API.

LIST ALL Carriers shows both stamps.com accounts and they both use carrierCode 'stamps_com' so when we want to order using the carrierCode it naturally just picks the first stamps.com account rather than letting us use the account name in addition to carrier code.