How to use SHA-1 dynamic key in Postman
<p>I'm trying to use Postman to send a GET http request which contains a parameter which is dynamically generated by taking the full request query string (everything to the right of the question mark in the URL, after URL encoding), concatenating a previously assigned shared secret key, and then performing a SHA-1 hash of the resulting string.</p>

<p>I would use a Pre-request Script to achieve this. </p>

<p>Thank you.</p>