I have erroneously created an “Integration”: Open In CryptPad - Apps - App Store - Nextcloud . I actually wanted to add an “App” (which I did successfully). In the “Account” page I can modify the integration, but I can not delete it.
Are you intending to remove an app or an integration registered in the app store? For apps, you can use the REST as suggested by @z4k. For integrations, I doubt it, but you could have a try. Just be prepared to readd the app in case.