How to change a global variable for particular GET request from collection?

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1

Example:
x-api-key:werwtreyt123etwrf543 i have set it in environment . But for particular request i need to send invalid x-api-key to verify the response.

2

you can use pm.variables.set(“name”, “value”), it gives opportunity to override global/environment/collection variables for one request, then it get clear.