When sending a POST to the following
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Glad to hear you got it working @ejohnson. The call you posted looked fine, do you mind sharing what the issue was for anyone else that comes across this post?
What would happen if you assigned a handle, and that handle already exists? Usually one does not include a handle as Shopify takes care of that from the name data. If a duplicate is found, Shopify would tack on a -1 or something to make the new handle unique allowing the code to succeed. But if you provide a handle, and it is dupe, would that not also trigger this exact same error scenario?