The Credentials list is a subresource connected to the Trunks. When Plivo receives a SIP INVITE command for a Trunk domain that has an associated credentials list, we prompt for authentication. In response, your system must provide a valid username and password to authenticate.
BaseURI
https://api.plivo.com/v1/Account/{auth_id}/Zentrunk/Credential/
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curl -i --user AUTH_ID:AUTH_TOKEN \
https://api.plivo.com/v1/Account/{auth_id}/Zentrunk/Credential/{credential_uuid}/