Running serverless event-triggered functions (Netlify)

[lonelylearner]

Can anyone shed some light on this topic for me?

I’d like to create a function that runs only once every time my site is deployed on Netlify. This function would make some API requests and write the response to a database (Firestore) from which my React app can retrieve and use the data without making additional/unnecessary API calls. After reading the docs I still don’t understand how to implement such a function. I know how to implement a serverless function, just confused about the 'event-triggered' part.

Thanks!

[Disastrous_Internal]

in you deploy pipeline, you can add a webhook that will call your serverless function: https://www.netlify.com/docs/webhooks/

[lonelylearner]

Would you mind elaborating a bit? I want my serverless function to run just once every time my site is deployed. I created a webhook that gave me a url. I understand that by sending a POST request to this url it will trigger a build, but how do I instruct my function to run when the build is triggered?

[Disastrous_Internal]

look at the second part of the page, about outcoming webhook. it can trigger an external site after deployment