How should I add Metafields data in productCreate?

Hi Folks,

I am pretty new to this and not a coder by anymeans but i am scrambling my way through it.

I have got a productCreate POST working fine, minus my custom metafields…

My question is… How should I be adding the Metafields data? Should it be inside the productCreate, or should it be by another means… There doesnt seem to be any clear arrticles in the Dev Section that covers this topic… metafields seems to be glassed over in any detail tbh.

Thank you in advance.

Sorry I should probably add that I have already pre-defined the metafields I need in products…