Odoo 13.0+e (Enterprise Edition)

Module: Authorize.Net Payment Acquirer 13.0.1.0

I'm assuming this is a problem with Authorize.Net Payment Acquirer, but it could be something else.

I have all of my information set up but when I go to pay I get the following error:

2020-11-23 20:38:02,563 6 ERROR odoo.http: Exception during JSON request handling. 
Traceback (most recent call last):
  File "/home/odoo/src/odoo/odoo/http.py", line 624, in _handle_exception
    return super(JsonRequest, self)._handle_exception(exception)
  File "/home/odoo/src/odoo/odoo/http.py", line 310, in _handle_exception
    raise pycompat.reraise(type(exception), exception, sys.exc_info()[2])
  File "/home/odoo/src/odoo/odoo/tools/pycompat.py", line 14, in reraise
    raise value
  File "/home/odoo/src/odoo/odoo/http.py", line 669, in dispatch
    result = self._call_function(**self.params)
  File "/home/odoo/src/odoo/odoo/http.py", line 350, in _call_function
    return checked_call(self.db, *args, **kwargs)
  File "/home/odoo/src/odoo/odoo/service/model.py", line 94, in wrapper
    return f(dbname, *args, **kwargs)
  File "/home/odoo/src/odoo/odoo/http.py", line 339, in checked_call
    result = self.endpoint(*a, **kw)
  File "/home/odoo/src/odoo/odoo/http.py", line 915, in __call__
    return self.method(*args, **kw)
  File "/home/odoo/src/odoo/odoo/http.py", line 515, in response_wrap
    response = f(*args, **kw)
  File "/home/odoo/src/odoo/addons/account_payment/controllers/payment.py", line 53, in invoice_pay_form
    'alias_usage': _('If we store your payment information on our server, subscription payments will be made automatically.'),
  File "/home/odoo/src/odoo/addons/account_payment/models/payment.py", line 25, in render_invoice_button
    values=values,
  File "/home/odoo/src/odoo/addons/payment/models/payment_acquirer.py", line 472, in render
    values = method(values)
  File "/home/odoo/src/odoo/addons/payment_authorize/models/payment.py", line 122, in authorize_form_generate_values
    temp_authorize_tx_values['x_fp_hash'] = self._authorize_generate_hashing(temp_authorize_tx_values)
  File "/home/odoo/src/odoo/addons/payment_authorize/models/payment.py", line 74, in _authorize_generate_hashing
    return hmac.new(bytes.fromhex(self.authorize_signature_key), data, hashlib.sha512).hexdigest().upper()
ValueError: non-hexadecimal number found in fromhex() arg at position 0