Ingest Accounts V2

This endpoint is for pushing customer(s) account(s) and balance(s) through the Bud architecture.
It can ingest data for multiple customers per request.
By default, this is synchronous and will report any issue with the data in the response.
If a 'X-Disable-Synchronous' header is present and set to true, the process will create a task in the background and be enrirely 'non-blocking'.
In this scenario, the response metadata will contain a Task ID and the next URL which would then be used for finding out the operation's result.