For anyone looking, the proper way to go about this is to use the Create Metafield method.  

Hi, thanks for responding. I've understood I have used inaccurate names to describe my problem. What I meant is I have metafield definitions in place and I want to populate those definitions but don't know how to grab the definitions to put my data.

Hi! I have a store with functionalities heavily reliant on products custom metafields. For a non-technical person, creating a product like that would be super difficult to fill out properly, so I want to create a base in airtable from where all corre...