we have created a custom app and try to install to dev store and production store (via link).
The link is redirected to our server (redirect_uri) but there is no code param, only hmac, shop, timestamp.
Can anyone help? We can not find any mistake, but we are new in Shopify apps.
AFAIK there is no difference in oAuth for public and custom apps.
We use @shopify/koa-shopify-auth for oAuth. It is working fine and I believe it is more reliable than the documentation. Take a look at it's source code.
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