External Database SYNC

Hi All,
I am trying to push data to a collection using the HTTP backend modules, however I am concerned about security. The only method that seems to work is changing permissions on the collection to allow anyone to create and update the collection. I am sure I missing something. I have looked at the OAuth examples, but that doesnt seem to apply as I dont have an “app”. I have tried basic auth from Postman, no luck.

Thanks in advance,
Scott