mfFiddle | Python Fiddle

import jwt
import os
import requests
import time

## Create jwt token
with open('private_key.pem', 'r') as rsa_priv_file:

#Not sure about adding the utf-8 AT ALL
    priv_rsakey = rsa_priv_file.read()

iat = int(time.time()) 
exp = iat + 600
encoded_jwt = jwt.encode({
    "sub": "sys",
    "iss": "matthew-fleming",
    "iat": iat,
    "exp": exp
    }, 
    priv_rsakey
, algorithm='RS256')

token = encoded_jwt.decode('utf-8')

## Create Shipper
endpoint = "https://api.sandbox.loadsmart.com/api/v2/shippers"
data = {
    "company_name": "Matts New Shipper v2"
    }
headers = {'Content-Type': 'application/json', 'Auth':token}

r = requests.post(url = endpoint, headers= headers, json= data)
print r
cargo = r.json()
shipper_id = cargo['data']['id']

## Create User

endpoint = "https://api.sandbox.loadsmart.com/api/v2/shippers/accounts"
data = {
    "shipper_id":str(shipper_id),
    "email": "admin+supertest@blabb.io"
    }
print data
headers = {'Content-Type': 'application/json', 'Auth':token}

r = requests.post(url = endpoint, headers= headers, json= data)

print r

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