Postman - oAuth 1.0 Signature Generation - NetSuite

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My question:
How does Postman generate it oauth signature. I am working with NetSuite and am getting a different signature than Postman despite following documentation

Details (like screenshots):
oauth from Postman:

Basic Code Generating Signature (Ruby)

My Signature: “pZ8QP1vyD+4Emgyxeu4pAtPRSTjD39oOuhBjWEG4imY=”
Postmans Signature: “B8KYY0W4LUwXCNzNfPmbQg0yiGbBSkhrLFWBhJ8tpps%3D”
How I found the problem:

  • Kept receiving invalid login from server

I’ve already tried: