clientid where to find.html - swisscom-api/doc GitHub Wiki
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After successful registration on Swisscom Developer Portal under ORGS/SPACES you can find the list of applications and associated with them client ids/secret_id.

Under Environment Tab of App you can find the clientId/secret_id.

Based on the authorization type in order to use Swisscom API you need only clientId or both clientId and secret_id for Oauth2 Authorization OAuth Overview.