https://bintray.
https://bintray.com/docs/api.html#_get_webhooks
https://bintray.
https://bintray.com/docs/api.html#_register_a_webhook
https://bintray.
https://bintray.com/docs/api.html#_delete_a_webhook
https://bintray.
https://bintray.com/docs/api.html#_test_a_webhook