what is the Install URL?

this is my installation url

the installation url is "https://api.trackingmore.com/intercom/install.php" Can you help me see what's wrong?

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this is the feedback from you

"Hi there! A couple further things to adjust and resubmit: 1. [Install URL] This redirects to Intercom's sign-in page. The Install URL should be the URL pointing to your external website/app, kicking off the OAuth 2.0 flow for installing your app via the App Store. https://developers.intercom.com/building-apps/docs/apps-in-messenger-configuring-your-app#section-providing-installation-urls | "

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But my installation url is indeed kick off the oauth process. trigger your oauth page first

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and the app below has same flow with me

When you click to install, you will be redirected to their link, and then an authorization box will pop up.

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intercom reply "1. [Install URL] This redirects to Intercom's sign-in page. The Install URL should be the URL pointing to your external website/app, kicking off the OAuth 2.0 flow for installing your app via the App Store." I can't figure it out anymore 😭

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You need to explain the problem clearly. If Intercom is not approving your app, they should provide you with a reason. If I was to guess, it's because your install URL kicks off the OAuth flow immediately. I believe this is incorrect. If you provide an external install URL, it should bring the user to a web page that explains the app which they can then install the app from e.g. 'Install Now'

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I follow this guide.

and this is my code of install.php to kick off oauth flow :

and intercom replied " [Install URL] This redirects to Intercom's sign-in page. The Install URL should be the URL pointing to your external website/app, kicking off the OAuth 2.0 flow for installing your app via the App Store."

😂 what's wrong with my code?