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can anyone guide me on the "invalid signature" issue while hitting rest api?

there have been a lot of oauth related issues lately

what are you using to generate the oauth signature

I am using HMAC-SHA1 outh signature method.

did you write your own code to do so, or a library

the error is suggesting that whatever is generating the signature is doing it wrong

that still doesnt sound like an existing oauth 1 library

if you are writing your own code to generate your signature, netsuite's error is saying you are doing it wrong

but the link you have shared is also using hmac

<https://github.com/oauthlib/oauthlib/blob/master/oauthlib/oauth1/rfc5849/signature.py>

hmac by itself is not going to do anything for you

my advice is to use an existing library to do your ouath authorization

if you want to do it yourself, expect to spend many hours learning how oauth base strings work

those are the existing solutions, i dont know python but the page suggests you should use *<https://github.com/litl/rauth|rauth>*