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Note: As of now there is no way available in keycloak to read custom query parameter in .ftl file.
E.g login URL for will be.
https://staging.open-sunbird.orgDOMAIN/auth/realms/sunbird/protocol/openid-connect/auth?redirect_uri=https://staging.open-sunbird.orgDOMAIN/oauth2callback&response_type=code&scope=offline_access&client_id=android&version=1
...