Hi,
it seems that adding a new Product via API is not supported by the Essential subscription. The ability to add a new product is available instead if you use your online version. I wasn't able to find any documentation about this issue.
This is the message we get from QBO: Feature Not Supported Error : We're sorry. This feature is not included in your QuickBooks Online Essentials.
The same function works well with a Pro subscription.
Is that confirmed? Where can we find what are the others limitations related to your api linked to the type of subscription?
Thanks,
Marco