Postman Pre-request Script

Hello everyone, the requirements is straight forward.

If you know how to create a simple postman script, I need your help.

Currently we are calculating the hmac manually to test using postman, I want to create "Environment" pre-request script that make few variables possible.

The url currently looks like this:

localhost:9000/api/v1/location?signature=9e60283fae31c5abc37714a8d3fe17b8ea4e428974767d9abc2c1ccf98db7db7

Signature is calculated using (api-key + timestamp) and applies hmac256 to it.

So the above signature for example is a result of

apikey of (turbymwmxpzebranm2fzemx2jozvvhodhburrmhr)

and timestamp of (1531004371)

and finally the secret key is (6e50faa44614f8ad4e1a4212ba69bc03df99b19115559d97cb9d1373646c7555)

You can test this here: [login to view URL]

Our target is to be able to make the following variables available in postman:

{{hmacAuthHeaderSignature}}

{{timestamp}}

{{apikey}}

{{placeholder for any other extra variable}}

So in the url example above it would be:

localhost:9000/api/v1/location?signature={{hmacAuthHeaderSignature}}

Thank you in advance

Correction for the example above:
secret key is: (j1egzakyjgxcaglvz2rwpgcommk3ttftenmketm3)

Resulted signature would be: (6e50faa44614f8ad4e1a4212ba69bc03df99b19115559d97cb9d1373646c7555)

API JavaScript

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