Coinbase Wallet API python Authentication Error, Invalid Signature

Python 3.4 Coinbase Wallet API V2 I have been stuck for some time trying to figure out while this buy call (and other api calls like get_payment_methods() and get_accounts() ) run into authentication errors. I have successfully been able to run some of these api calls alone in a separate file. What Does Not Work: class api_call(object): def __init__(self): self.CB_key = xxxxxxxx self.CB_secret = yyyyyyyy self.CB_account = zzzzzzzzz self.CB_payment_method = aaaaaaaaaa def buy_c(self, exchange, b_amount): client = Client(self.CB_key, self.CB_secret) buy = client.buy(self.CB_account, amount=str(b_amount), currency="USD", payment_method=self.CB_payment_method) api = api_call() buy = api.buy('COIN-BS', 1) I have triple checked my accounts, keys and secrets and have also tried hard coding them inside the class definition instead of using init members. What Works: from coinbase.wallet.client import Client client = Client(<api_key>, <api_secret>) buy = client.buy('zzzzzzzz', amount='1', currency="USD", payment_method='aaaaaaaaaa') The error is as follows: Traceback (most recent call last): File "api_call.py", line 126, in <module> buy = api.buy('COIN-BS', 1) File "api_call.py", line 110, in buy buy = client.buy_c( self.CB_account, amount=str(amount), currency="USD", payment_method="XXXXXXXXXXXX") File "/home/LA/.local/lib/python3.4/site-packages/coinbase/wallet/client.py", line 381, in buy response = self._post('v2', 'accounts', account_id, 'buys', data=params) File "/home/LA/.local/lib/python3.4/site-packages/coinbase/wallet/client.py", line 132, in _post return self._request('post', *args, **kwargs) File "/home/LA/.local/lib/python3.4/site-packages/coinbase/wallet/client.py", line 116, in _request return self._handle_response(response) File "/home/LA/.local/lib/python3.4/site-packages/coinbase/wallet/client.py", line 125, in _handle_response raise build_api_error(response) coinbase.wallet.error.AuthenticationError: APIError(id=authentication_error): invalid signature Im thinking that the problem may be due to the use of the API buy method inside of a definition of a class file, that is my api_call.py class.I think this because I can call the buy method ( and others ) just fine from separate files and even outside of the class indentations inside of api_call.py. Does anyone have any idea why this would raise an Authentication Error? I have looked around in error.py, but haven't yet found a clue on why this might be happening. As always, any help or thoughts regarding the matter is much appreciated! EDIT After running the working and non working code on the same file, *I was successfully able to make both buys. Apparently any POSTs to the API using those member variables, and any instances of client made with member variables wont be authenticated (i.e. self.CB_key ... ). from coinbase.wallet.client import Client #Globals key = 'xxxxxx' secret = 'yyyyyy' account = 'zzzzzzz' payment = 'aaaaaaa' class api_call(object): def __init__(self): self.CB_key = None self.CB_secret = None self.CB_account = None self.CB_payment_method = None def buy_c(self, exchange, b_amount): client = Client(key, secret) buy = client.buy(account, amount=str(b_amount), currency="USD", payment_method=payment) client = Client(key, secret) buy = client.buy(account, amount='1', currency="USD", payment_method=payment) api = api_call() buy = api.buy_c('COIN-BS', 1)