Hank here from Shopify.
We would not be able to offer a callback service via the forums, however, I will share with you a link to our live support page.
Some phone conversations have been moved to live chat and email to help serve our merchants more efficiently, but depending on the call queue time, you may be offered a call back from one of the guru teams.
That said, I am also happy to assist you via the forums should you need any assistance!
All the best,