Power Pages sites can have OAuth 2.0 implicit grant flow enabled, so you can obtain an authentication token that has your Portal as the issuer, and you can use this token to do authenticated calls to external APIs.
This post is a quick overview and summary of useful posts in the subject, as there are some good content around, I thought it would be useful to collate the links in a single place.
This Microsoft tutorial explains how to enable the OAuth 2.0 implicit flow in your site:
After enabling OAuth 2.0 implicit flow, you can obtain a token by calling the following endpoint and then use it to call the authenticated API:
More About This Author
SharePoint and Office 365 Consultant/Developer always trying to get the best from Microsoft stack (Microsoft 365/Azure/Power Platform and related stuff).
Living in Ireland since 2018, I had previously worked in Brazil as a consultant/developer for Office 365, SharePoint and related technologies for almost 10 years.
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