Delete a credential resource
Username and password information for SIP Domains
Delete a credential resource.
DELETE
/2010-04-01/Accounts/{AccountSid}/SIP/CredentialLists/{CredentialListSid}/Credentials/{Sid}.json
curl \
-X DELETE https://api.twilio.com/2010-04-01/Accounts/{AccountSid}/SIP/CredentialLists/{CredentialListSid}/Credentials/{Sid}.json \
--user "username:password"