DELETE
/2010-04-01/Accounts/{AccountSid}/SigningKeys/{Sid}.json
curl \
--request DELETE 'https://api.twilio.com/2010-04-01/Accounts/{AccountSid}/SigningKeys/{Sid}.json' \
--user "username:password"
curl \
--request DELETE 'https://api.twilio.com/2010-04-01/Accounts/{AccountSid}/SigningKeys/{Sid}.json' \
--user "username:password"