Unable to proceed with TypeError: update_token() argument after ** must be a mapping, not str

[bishwadeep]

Hey guys,
I need help as I am not able to resolve this issue for so long. Now I am stuck in the last function, Any help would be really appreciated. I used the code from here: XeroAPI/xero-python-custom-connections-starter#1 to get the tocken.
``
Traceback (most recent call last):
File "", line 1, in
File "/code/providers/xero_invoice.py", line 308, in invoiceGetActiveProviders
results = accounting_api.create_invoices(xero_tenant_id, invoice, True)
File "/usr/local/lib/python3.7/site-packages/xero_python/accounting/api/accounting_api.py", line 2493, in create_invoices
collection_formats=collection_formats,
File "/usr/local/lib/python3.7/site-packages/xero_python/api_client/init.py", line 365, in call_api
_request_timeout,
File "/usr/local/lib/python3.7/site-packages/xero_python/api_client/init.py", line 186, in __call_api
self.update_params_for_auth(header_params, query_params, auth_settings)
File "/usr/local/lib/python3.7/site-packages/xero_python/api_client/init.py", line 579, in update_params_for_auth
auth_setting = auth_setting(api_client=self)
File "/usr/local/lib/python3.7/site-packages/xero_python/api_client/oauth2.py", line 176, in create_auth_settings
self.update_token(**api_client.get_oauth2_token())
TypeError: update_token() argument after ** must be a mapping, not str

Here is the code:
I have a custom connection setup in the xero. I have setup the app and collected the client id and client secret. I have a cron job file which push the invoice. So, I dont want to use flask. I am able to get the token. The error is when I run accounting_api.create_invoices(xero_tenant_id, invoice, True)
``
def invoiceGetActiveProviders():
xero_tenant_id = "Replaced by my tenant id"
xero_client = ApiClient(
Configuration(
debug=False,
oauth2_token=OAuth2Token(
client_id="REPLACED BY CLIENT ID WORKING FINE", client_secret="REPLACED BY SECRET WORKING FINE"
),
),
pool_threads=1,
)
accounting_api = AccountingApi(xero_client)
#my oauth v1 code to create invoice
invoice = '[{'Type': 'ACCREC', 'Contact': {'ContactID': 'REPLACED BY CONTACT ID'}, 'Date': datetime.datetime(2021, 12, 1, 18, 50, 52, 587675), 'DateString': '2021-11-30 18:50:52', 'Reference': 'Nov 2021 Leads', 'DueDate': datetime.datetime(2022, 1, 2, 18, 50, 52, 587668), 'DueDateString': '2022-01-02 18:50:52', 'CurrencyCode': 'AUD', 'LineItems': [{'Description': 'CareerFAQs.com.au AUS Lead', 'Quantity': 1, 'UnitAmount': 65.0, 'AccountCode': '41000', 'ItemCode': '1060'}]}]'

accounting_api.create_invoices(xero_tenant_id, invoice, True)
``