How can I host and authenticate my app at a specific URL?

Goal: Host the Shopify app at https://example.com/shopify and use https://example.com/shopify/authenticate as the OAuth/auth callback URL.
Action: Added https://example.com/shopify/authenticate to the app’s whitelist of allowed redirect URLs.
Problem: During installation, Shopify redirects to https://example.com/shopifyauthenticate (missing the slash), not the whitelisted https://example.com/shopify/authenticate, breaking the OAuth flow.
Open question: How to configure Shopify so both the app and its auth callback can live under a subdirectory (e.g., /shopify) without the path being concatenated incorrectly.
Status: Unresolved; seeking guidance or confirmation on any platform limitations for subpath-based auth URLs.

Summarized with AI on January 26. AI used: gpt-5.

shipify June 1, 2023, 12:22am 1

I would like to host my app at https://example.com/shopify and my auth URL at https://example.com/shopify/authenticate

Any idea how that can be done? I whitelisted https://example.com/shopify/authenticate but when installing, shopify keeps trying to redirect to https://example.com/authenticate

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