Connect API to Shopify
In the Shopify store you wish to add these products to, you can create an access token with permission to create products. Using that token, you are free to make API calls to the Shopify store, with the data representing products, to create products in the Shopify store. Very simple pattern. Takes about 30 seconds of your time to create the access token in the Shopify store admin.
No you have to create APP for it.
As per latest updates from Shopify, you need to create "Custom App" atleast to get the Access Tokens and API keys, because Shopify has depreciated "Private apps" They work like Private apps, as those apps are specific to only one store, but these apps can give you all the needed permission to Create and Fetch Products.
You can create new apps from admin panel here: [YourStoreDomain]/admin/settings/apps/development
Documentations realated to it is: https://help.shopify.com/en/manual/apps/custom-apps (https://help.shopify.com/en/manual/apps/custom-apps)
From Shopify: https://help.shopify.com/en/manual/apps/private-apps (https://help.shopify.com/en/manual/apps/private-apps) Note Private apps are deprecated and can't be created as of January 2022. Ask your app developer to create a custom app. Like private apps, custom apps are built exclusively for your shop, but they don't require open API access to your store or access to your Shopify admin.
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