From ​​​​​@Heather Spoelstra 

Hi there,

While there's not currently an option in Iterable to designate webhook fields as required, we can absolutely log a feature request for this ask. If you'd like to create a support ticket by emailing support@iterable.com with more details about your use case, they may be able to come up with a workaround for you. Offhand I'm thinking that if you're using this in a journey webhook, you can have a journey filter that first checks for the existence of that field, but with more details our support team can offer a more personalized recommendation.

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