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If you choose to use the variable, you will then only need to update it in one place rather than in each request you define. You will find your variables in 'Environments' on the left of the Postman screen:
...
If you choose to use the variable, you will then only need to update it in one place rather than in each request you define. You will find your variables in 'Environments' on the left of the Postman screen: