Step "admin/oauth/access_token" returning HTML code of Login page instead of access token

[test_bme]

I have created Integration for Shopify and using it from 1 year. From last week, it’s not working because after posting data to “https://SHOP_NAME.myshopify.com/admin/oauth/access_token”;, instead of returning access token it is giving me the HTML code of the Shopify Login Page.

[Josh_Brown2]

There was a small change made to the OAuth process last week. You can read more about it here: https://ecommerce.shopify.com/c/api-announcements/t/oauth-api-endpoint-changes-to-signature-verifica...

Are you able to install any other apps in your store? They all use OAuth, so this can help you determine if there is a problem specific to your store.

Normally you could receive the login page if you made a GET request by mistake instead of a POST request.

Josh