The three operations are supported by the power apps portal web api are create, read, update and delete.
<h3>What does the Power Apps portal do?</h3>
Developers of Power Apps can now design a potent new kind of user interface: external-facing websites that let visitors from outside their organizations create and view data in Microsoft Dataverse or even browse content anonymously.
PowerApps's personalized APIs Custom APIs are an effective way for PowerApps to connect to any existing API, hosted anywhere. To register or use a Custom API, you do not require a PowerApps Enterprise subscription.
Therefore, The portals Web API makes it possible for Power Apps portal pages to offer a richer user experience. All Microsoft Dataverse tables can be created, read, updated, and deleted using the Web API from your portal pages.
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