Prisma

Quick question: I am building a dynamic `CardStack` that takes in an `ImageURL` a `name` and a `price` from a price index API that I am using. How can I have my `CardStack` approve the addition of a new card based on my API and whether it has that price for that certain item? As well as decline the addition to the `CardStack` if the API doesn't have the price.

<@U5W627J2F> hey, that's a first question, and a great one indeed :stuck_out_tongue: I was waiting for it haha

From your description it sounds like you want to validate the input parameters for every `createCardStack` mutation based on an external API, is that correct?

You can do so using a function across the request pipeline. Typically you would use `PRE_WRITE` for that: <https://www.graph.cool/docs/reference/functions/request-pipeline/communicate-with-external-apis-phe1gei6io/#call-to-external-api>

That's exactly what I want to do! Thanks for the info! Going to comb through it now and see how it works