Custom OIDC Identity Provider - "Access token request error" after successful /token response (Shopify Plus)

Authentication & Access
1

Short description of issue

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I created custom OIDC using Firebase. I was able to log in via Google but when I log out and try to log in again, I get this screen saying “Access token request error.”

I assume that this is a cache problem?

The url of this page is
https://shopify.com/authentication/77788414198/login/external/callback?code=ABC..&state=ABC…

Please help!

What type of topic is this

Custom OIDC

2

To anyone having the same issue:

I found out that this is due to the timeout.

Shopify’s current timeout is 1000ms

3

Thanks @Isaac_Choi1 for sharing, marking this as solved for now. Also, I can confirm that Shopify’s default timeout for external OIDC provider requests is 1 second (1000 ms).

Just wanted to share that confirmation in case it’s helpful for anyone stumbling a cross this post.