# Public callback url (RPC or event call)

**URL:** <https://forum.heroiclabs.com/t/public-callback-url-rpc-or-event-call/2996>\
**Category:** Runtime Framework\
**Tags:** authentication, server-framework\
**Created:** [September 5, 2022, 12:24pm UTC](https://forum.heroiclabs.com/t/public-callback-url-rpc-or-event-call/2996 "2022-09-05T12:24:08Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![toby](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.heroiclabs.com/toby/32/1240_2.png) [@toby](https://forum.heroiclabs.com/u/toby)\
**Post date:** [September 5, 2022, 12:24pm UTC](https://forum.heroiclabs.com/t/public-callback-url-rpc-or-event-call/2996/1 "2022-09-05T12:24:08Z")

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Hi all,  
It is possible to call and event or RPC or something without authentication?

Basically I need to provide a third party service with a callback url and cannot see how Nakama could receive this callback without a bearer token in the header which i cannot set from the third party.

any advice would be very welcome  
thanks

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<div class="post-metadata">

**Author:** ![flavio](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.heroiclabs.com/flavio/32/2161_2.png) [@flavio](https://forum.heroiclabs.com/u/flavio)\
**Post date:** [September 5, 2022, 1:28pm UTC](https://forum.heroiclabs.com/t/public-callback-url-rpc-or-event-call/2996/2 "2022-09-05T13:28:23Z")

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Hello @toby

For examples on how to setup server to server interactions, you can check the following page [Nakama: Server Runtime Examples | Heroic Labs Documentation](https://heroiclabs.com/docs/nakama/server-framework/runtime-examples/#server-to-server)

I hope it helps.

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<div class="post-metadata">

**Author:** ![toby](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.heroiclabs.com/toby/32/1240_2.png) [@toby](https://forum.heroiclabs.com/u/toby)\
**Post date:** [September 5, 2022, 2:12pm UTC](https://forum.heroiclabs.com/t/public-callback-url-rpc-or-event-call/2996/3 "2022-09-05T14:12:09Z")

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That is exactly what I need, thank you.

I have read that page before and I didn’t realise what the “Runtime HTTP Key” did. Reading the docs back now seems obvious so I must have had a brain freeze.

Just tested an RPC call using the curl example in the docs and it works a treat.