How does IDN know what source to create the account on?
Creating accounts using /v3/accounts has some serious caveats that you should be aware of. This thread should answer your question, and it also provides more context around /v3/accounts that you should read closely before continuing with this endpoint.
@colin_mckibben Thanks for the info. We have used the /v2 to create new flat file accounts and that has worked as expected. In the other thread there is a sourceId but that does not appear in the API documentation.
Other than these threads how would I know about that?