Looking for JSON WEB Token Expert to to avoid token invalid failure while sending an API Request

Job ID: 37702160

Budget: ₹1,500 – ₹12,500 INR

Looking for JSON WEB Token Expert to to avoid token invalid failure while sending an API Request. At present if i modify any payload then its gets failed as token invalid OR Invalid signature. My requirement is to modify the payload with the same signature or anyway that API should accept it.