I am trying to build a C# library for the Etsy API. I only see Etsy 2.0 and 1.0 APIs available on nuGet.
How do I find a listing, based on SKU? I find no endpoint: https://developers.etsy.com/documentation/reference#operation/getListing
If no endpoint exists, do I need to pull all the listings, enumerate and match the SKU?
There is no endpoint available (currently) which allows you to get a listing using its SKU, only using the internal Etsy ListId.
I'd recommend that you raise an issue on Etsy's API Github repo to request it as a new feature and who knows, they may build an endpoint for it.