Can custom connector triggers use webhooks with security?

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Posted on by DerekHurley

I am creating a custom connector and I have authentication and the actions sorted, I just need to figure out the triggers. The webhooks that I am trying to work with have security, hashed using HMACSHA256 and base64 encoded (webhook docs here).

Does anyone know is it possible use a webhook that is hashed using HMACSHA256 as a custom connector trigger?

Thanks in advance

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cchannon 4,702 Super User 2025 Season 1 on at

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Re: Can custom connector triggers use webhooks with security?

It might be possible to accomplish this on the PowerApps side... not really sure how... but this is not your biggest problem. The Overview documentation page from your link above also references an example API endpoint as:

https://api.xero.com/api.xro/2.0/Contacts/717f2bfc-c6d4-41fd-b238-3f2f0c0cf777

This is a big problem for Custom Connectors because Custom Connectors have no mechanism for building parameterized URLs. None whatsoever. Unless you can hardcode the ID into the url for the custom connector (I assume that is not an option) custom connectors simply cannot get the job done here. You will need to write your own connector (probably as an Azure Function) to act as the interface here. Bonus: it will be much easier to handle your hashing requirements there than in some convoluted PowerAutomate approach.