Learn: Create Power Automate Custom Connector – API Key Authentication


This article provides a step-by-step guide on how to create a custom connector from scratch and implement API key authentication. The authentication code used in the guide is referenced from a YouTube video by Nick Chapsas. The article includes code snippets and instructions on creating a web API, adding authentication constants, creating custom middleware for API authentication, and gluing the code together in the program file. It also covers deploying the API, creating a custom API in Postman, and testing the custom connector in Power Automate. The article concludes with a sample appsettings.json file and a Power Automate flow testing result.


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