community-6818.py

## In response to https://community.coinbase.com/t/exchange-api-order-placement-results-in-a-missing-product-id/6818

import json, hmac, hashlib, time, base64, requests
from requests.auth import AuthBase

# Sandbox credentials and code. Key has all permissions.
API_KEY = ''
API_SECRET = ''
API_PASS = ''


class CoinbaseExchangeAuth(AuthBase):
    def __init__(self, api_key, secret_key, passphrase):
        self.api_key = api_key
        self.secret_key = secret_key
        self.passphrase = passphrase

    def __call__(self, request):
        timestamp = str(time.time())
        message = (timestamp + request.method + request.path_url + (request.body or '')).encode("utf-8")
        hmac_key = base64.b64decode(self.secret_key)
        signature = hmac.new(hmac_key, message, hashlib.sha256)
        signature_b64 = base64.b64encode(signature.digest())

        request.headers.update({
            'CB-ACCESS-SIGN': signature_b64,
            'CB-ACCESS-TIMESTAMP': timestamp,
            'CB-ACCESS-KEY': self.api_key,
            'CB-ACCESS-PASSPHRASE': self.passphrase,
            'Content-Type': 'application/json',
            'Accept': 'application/json'
        })
        return request
        
api_url = 'https://api-public.sandbox.exchange.coinbase.com/'
auth = CoinbaseExchangeAuth(API_KEY, API_SECRET, API_PASS)

order_dict = {
        "price": "500.00",
        "size": "0.01",
        "side": "buy",
        "product_id": "BTC-USD"
}

res = requests.post(api_url + 'orders', data=json.dumps(order_dict), auth=auth)

print res.text