There have long been requests for “shared write access” to feeds, which can be done using the feed sharing feature already built into IO, but that requires everyone sending data to have an Adafruit IO account and use their credentials to send data.
A webhook in web development is a method of augmenting or altering the behaviour of a web page, or web application, with custom callbacks. These callbacks may be maintained, modified, and managed by third-party users and developers who may not necessarily be affiliated with the originating website or application.
For Adafruit IO, webhooks are unique URLs that you can use to send data to your feeds from anywhere on the internet, without having to share your IO API secret keys.
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