This post provides a simple example of how a Dynamics 365 C# plugin can connect to an external REST API (i.e. sitting outside of the Dynamics 365 environment). (The class used to achieve this being the RestClient class.)

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The Code

Based on my experience, it seems calling a REST API from a plugin can be a bit challenging. This could be based on security issues or perhaps the way Dynamics handles asynchronous code. Anyway, the code sample below works.

It represents a simple ‘action’ which was registered as ‘None’

and ‘PostOperation’

and tested with the CRM REST Builder tool

References

https://restsharp.dev/docs/usage/client/