post https://api-sandbox.orum.io/deliver/transfer-groups
Create a Transfer Group object.
Transfer groups allow users to tie together all transfers that may be associated with the same flow. Each transfer group must be assigned a "source" or "destination" upon creation to signify where the flow is originating from or ending at.
Once a transfer group is created, users can then attach the generated unique ID to all applicable transfers made moving forward. All transfers in a group can be retrieved using the Get a Transfer Group API.