How to pass multiple query params on an external API

Hi there, I have created a POST Endpoint and added an external API request in the function stack.

Now this external API needs to have 3 required query params but it seems that I can only select one 'params' with the UI.

This is the structure of the external API endpoint:
https://exmaple.com/v1/order?param1=var1&param2=var2&param3=var2
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