Trying to use a Zoho Billing connector with the but sync is failing

[priyank-atspark]

Connector Name

zoho billing

Connector Version

0.0.44

What step the error happened?

During the sync

Relevant information

Tried many times to sync the data but everytime it gives the same error.

Relevant log output

Sync failed

0 bytes
|
no records loaded
|
3m 17s
Failure in source: Checking source connection failed - please review this connection's configuration to prevent future syncs from failing

Feb 19, 2026, 2:57 PM


Sync started

Congnitics manually started a sync
Feb 19, 2026, 2:54 PM

Connection settings changed

Congnitics added a stream prefix: "zoho_billing_" and 2 other changes. 
View details

Feb 19, 2026, 2:49 PM



Feb 19
Logs: acme_inc_zoho_billing


Attempt 2 of 2
Feb 19, 2026, 2:57 PM
|
0 bytes
|
no records extracted
|
no records loaded
|
Job id: 71384496
|
20s


Failure in source: Checking source connection failed - please review this connection's configuration to prevent future syncs from failing
Search logs

Log sources

4

Log levels

5
2026-02-19 14:57:54 source ERROR Encountered an error while checking availability of stream Products. Error: 400 Client Error:  for url: https://accounts.zoho.com/oauth/v2/tokenError traceback: 
 Traceback (most recent call last):
  File "/usr/local/lib/python3.13/site-packages/airbyte_cdk/sources/declarative/checks/check_stream.py", line 113, in _check_stream_availability
    stream_is_available, reason = evaluate_availability(stream, logger)
                                  ~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.13/site-packages/airbyte_cdk/sources/declarative/checks/check_stream.py", line 26, in evaluate_availability
    availability = stream.check_availability()
  File "/usr/local/lib/python3.13/site-packages/airbyte_cdk/sources/streams/concurrent/default_stream.py", line 117, in check_availability
    next(iter(partition.read()))
    ~~~~^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.13/site-packages/airbyte_cdk/sources/declarative/stream_slicers/declarative_partition_generator.py", line 91, in read
    for stream_data in self._retriever.read_records(
                       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^
        self._schema_loader.get_json_schema(), self._stream_slice
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    ):
    ^
  File "/usr/local/lib/python3.13/site-packages/airbyte_cdk/sources/declarative/retrievers/simple_retriever.py", line 460, in read_records
    yield from self._read_pages(record_generator, _slice)
  File "/usr/local/lib/python3.13/site-packages/airbyte_cdk/sources/declarative/retrievers/simple_retriever.py", line 398, in _read_pages
    response = self._fetch_next_page(stream_slice, next_page_token)
  File "/usr/local/lib/python3.13/site-packages/airbyte_cdk/sources/declarative/retrievers/simple_retriever.py", line 315, in _fetch_next_page
    return self.requester.send_request(
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~^
        path=self._paginator_path(
        ^^^^^^^^^^^^^^^^^^^^^^^^^^
    ...<22 lines>...
        log_formatter=self.log_formatter,
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    )
    ^
  File "/usr/local/lib/python3.13/site-packages/airbyte_cdk/sources/declarative/requesters/http_requester.py", line 467, in send_request
    headers=self._request_headers(
            ~~~~~~~~~~~~~~~~~~~~~^
        stream_state, stream_slice, next_page_token, request_headers
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    ),
    ^
  File "/usr/local/lib/python3.13/site-packages/airbyte_cdk/sources/declarative/requesters/http_requester.py", line 315, in _request_headers
    headers = self._get_request_options(
        stream_state,
    ...<4 lines>...
        extra_headers,
    )
  File "/usr/local/lib/python3.13/site-packages/airbyte_cdk/sources/declarative/requesters/http_requester.py", line 298, in _get_request_options
    auth_options_method(),
    ~~~~~~~~~~~~~~~~~~~^^
  File "/usr/local/lib/python3.13/site-packages/airbyte_cdk/sources/streams/http/requests_native_auth/abstract_oauth.py", line 93, in get_auth_header
    token = self.access_token if self._is_access_token_flow else self.get_access_token()
                                                                 ~~~~~~~~~~~~~~~~~~~~~^^
  File "/usr/local/lib/python3.13/site-packages/airbyte_cdk/sources/streams/http/requests_native_auth/abstract_oauth.py", line 109, in get_access_token
    self.refresh_and_set_access_token()
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^
  File "/usr/local/lib/python3.13/site-packages/airbyte_cdk/sources/streams/http/requests_native_auth/abstract_oauth.py", line 120, in refresh_and_set_access_token
    token, expires_in = self.refresh_access_token()
                        ~~~~~~~~~~~~~~~~~~~~~~~~~^^
  File "/usr/local/lib/python3.13/site-packages/airbyte_cdk/sources/streams/http/requests_native_auth/abstract_oauth.py", line 182, in refresh_access_token
    response_json = self._make_handled_request()
  File "/usr/local/lib/python3.13/site-packages/backoff/_sync.py", line 105, in retry
    ret = target(*args, **kwargs)
  File "/usr/local/lib/python3.13/site-packages/airbyte_cdk/sources/streams/http/requests_native_auth/abstract_oauth.py", line 267, in _make_handled_request
    response.raise_for_status()
    ~~~~~~~~~~~~~~~~~~~~~~~~~^^
  File "/usr/local/lib/python3.13/site-packages/requests/models.py", line 1026, in raise_for_status
    raise HTTPError(http_error_msg, response=self)
requests.exceptions.HTTPError: 400 Client Error:  for url: https://accounts.zoho.com/oauth/v2/token
Traceback (most recent call last):
  File "/usr/local/lib/python3.13/site-packages/airbyte_cdk/sources/declarative/checks/check_stream.py", line 113, in _check_stream_availability
    stream_is_available, reason = evaluate_availability(stream, logger)
                                  ~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.13/site-packages/airbyte_cdk/sources/declarative/checks/check_stream.py", line 26, in evaluate_availability
    availability = stream.check_availability()
  File "/usr/local/lib/python3.13/site-packages/airbyte_cdk/sources/streams/concurrent/default_stream.py", line 117, in check_availability
    next(iter(partition.read()))
    ~~~~^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.13/site-packages/airbyte_cdk/sources/declarative/stream_slicers/declarative_partition_generator.py", line 91, in read
    for stream_data in self._retriever.read_records(
                       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^
        self._schema_loader.get_json_schema(), self._stream_slice
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    ):
    ^
  File "/usr/local/lib/python3.13/site-packages/airbyte_cdk/sources/declarative/retrievers/simple_retriever.py", line 460, in read_records
    yield from self._read_pages(record_generator, _slice)
  File "/usr/local/lib/python3.13/site-packages/airbyte_cdk/sources/declarative/retrievers/simple_retriever.py", line 398, in _read_pages
    response = self._fetch_next_page(stream_slice, next_page_token)
  File "/usr/local/lib/python3.13/site-packages/airbyte_cdk/sources/declarative/retrievers/simple_retriever.py", line 315, in _fetch_next_page
    return self.requester.send_request(
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~^
        path=self._paginator_path(
        ^^^^^^^^^^^^^^^^^^^^^^^^^^
    ...<22 lines>...
        log_formatter=self.log_formatter,
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    )
    ^
  File "/usr/local/lib/python3.13/site-packages/airbyte_cdk/sources/declarative/requesters/http_requester.py", line 467, in send_request
    headers=self._request_headers(
            ~~~~~~~~~~~~~~~~~~~~~^
        stream_state, stream_slice, next_page_token, request_headers
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    ),
    ^
  File "/usr/local/lib/python3.13/site-packages/airbyte_cdk/sources/declarative/requesters/http_requester.py", line 315, in _request_headers
    headers = self._get_request_options(
        stream_state,
    ...<4 lines>...
        extra_headers,
    )
  File "/usr/local/lib/python3.13/site-packages/airbyte_cdk/sources/declarative/requesters/http_requester.py", line 298, in _get_request_options
    auth_options_method(),
    ~~~~~~~~~~~~~~~~~~~^^
  File "/usr/local/lib/python3.13/site-packages/airbyte_cdk/sources/streams/http/requests_native_auth/abstract_oauth.py", line 93, in get_auth_header
    token = self.access_token if self._is_access_token_flow else self.get_access_token()
                                                                 ~~~~~~~~~~~~~~~~~~~~~^^
  File "/usr/local/lib/python3.13/site-packages/airbyte_cdk/sources/streams/http/requests_native_auth/abstract_oauth.py", line 109, in get_access_token
    self.refresh_and_set_access_token()
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^
  File "/usr/local/lib/python3.13/site-packages/airbyte_cdk/sources/streams/http/requests_native_auth/abstract_oauth.py", line 120, in refresh_and_set_access_token
    token, expires_in = self.refresh_access_token()
                        ~~~~~~~~~~~~~~~~~~~~~~~~~^^
  File "/usr/local/lib/python3.13/site-packages/airbyte_cdk/sources/streams/http/requests_native_auth/abstract_oauth.py", line 182, in refresh_access_token
    response_json = self._make_handled_request()
  File "/usr/local/lib/python3.13/site-packages/backoff/_sync.py", line 105, in retry
    ret = target(*args, **kwargs)
  File "/usr/local/lib/python3.13/site-packages/airbyte_cdk/sources/streams/http/requests_native_auth/abstract_oauth.py", line 267, in _make_handled_request
    response.raise_for_status()
    ~~~~~~~~~~~~~~~~~~~~~~~~~^^
  File "/usr/local/lib/python3.13/site-packages/requests/models.py", line 1026, in raise_for_status
    raise HTTPError(http_error_msg, response=self)
requests.exceptions.HTTPError: 400 Client Error:  for url: https://accounts.zoho.com/oauth/v2/token
2026-02-19 14:57:54 source ERROR Check failed
2026-02-19 14:57:54 platform INFO Checking for optional control message...
2026-02-19 14:57:54 platform INFO Writing output of 09c98db2-9ccc-4a5c-bf06-1ca31f626c1c_71384496_1_check to the doc store
2026-02-19 14:57:55 platform INFO Marking workload 09c98db2-9ccc-4a5c-bf06-1ca31f626c1c_71384496_1_check as successful
2026-02-19 14:57:55 platform INFO Deliberately exiting process with code 0.
2026-02-19 14:57:55 platform INFO 
2026-02-19 14:57:55 platform INFO ----- END CHECK -----
2026-02-19 14:57:55 platform INFO 
2026-02-19 14:57:56 platform INFO Retry State: RetryManager(completeFailureBackoffPolicy=BackoffPolicy(minInterval=PT10S, maxInterval=PT30M, base=3), partialFailureBackoffPolicy=null, successiveCompleteFailureLimit=5, successivePartialFailureLimit=1000, totalCompleteFailureLimit=5, totalPartialFailureLimit=20, successiveCompleteFailures=2, successivePartialFailures=0, totalCompleteFailures=2, totalPartialFailures=0)
 Backoff before next attempt: 30 seconds
2026-02-19 14:57:56 platform ERROR Failing job: 71384496, reason: 'Encountered an error while checking availability of stream Products. Error: 400 Client Error:  for url: https://accounts.zoho.com/oauth/v2/token'

Contribute

• Yes, I want to contribute

[octavia-bot]

AI Triage Starting...

Thank you for opening this issue! I'm an AI assistant that will do an initial review and may:

• Ask clarifying questions if needed
• Suggest relevant documentation or workarounds
• Flag this for internal visibility

Note: Community issues are reviewed on a best-effort basis and do not have a guaranteed response time. For additional help:

• Join the Airbyte Community Slack to connect with other users and community members
• If you're an Airbyte Cloud customer, you can open a support ticket or contact your account representative, referencing this issue URL

View playbook

• 🔗 Session URL: https://app.devin.ai/sessions/4f1f435564b1405695372c61ae517bb2

✅ Devin AI session created successfully!

[devin-ai-integration]

Hi Priyank Patel (@priyank-atspark), thank you for reporting this issue!

The error in your logs points to a 400 Bad Request when the connector tries to refresh the OAuth access token at https://accounts.zoho.com/oauth/v2/token. This happens before any data is fetched — the connector cannot authenticate with Zoho's OAuth service.

This is almost always caused by one of the following configuration issues:

Troubleshooting Steps

1. Verify Your Region Setting

The connector uses the region field to build the OAuth token URL. The .com domain in your error log indicates you have region set to com. Make sure this matches the Zoho data center where your account is registered. Zoho supports multiple regions: com, eu, in, com.cn, com.au, jp, sa, ca.

You can check which data center your account uses by logging into Zoho and looking at the domain in your browser's address bar (e.g., accounts.zoho.eu means you should use region eu).

2. Regenerate Your Refresh Token

Zoho refresh tokens can become invalid if:

• The token was revoked or regenerated in the Zoho API Console
• The associated OAuth client was modified or deleted
• The token has expired (Zoho refresh tokens can expire if unused for extended periods)

To generate a new refresh token:

1. Go to the Zoho API Console
2. Select your Self Client or Server-based Application
3. Generate a new authorization code with the required scopes (e.g., ZohoSubscriptions.fullaccess.all)
4. Exchange it for a new refresh token
5. Update the connector configuration with the new refresh token

3. Verify Client ID and Client Secret

Ensure the client_id and client_secret in your Airbyte connector configuration exactly match those shown in the Zoho API Console for your registered application.

4. Check OAuth Scopes

When generating the authorization code, make sure you requested the correct scopes for Zoho Billing (Zoho Subscriptions API). The scope should be: ZohoSubscriptions.fullaccess.all (or more granular read scopes as needed).

Could you confirm the following?

1. Which Zoho data center region is your account on (e.g., .com, .eu, .in)?
2. Are you using Airbyte Cloud or Airbyte OSS (self-hosted)?
3. Were you able to successfully complete the Test Connection step when first setting up this source?

Please ensure you mask or remove any sensitive information (API keys, passwords, tokens, connection strings) before sharing any additional logs or configuration.

---

Need more help? Join Airbyte Community Slack for peer support, or if you're a Cloud customer, open a support ticket referencing this URL.

This message is generated from Devin.ai (internal session link).

[priyank-atspark]

Yes, I have already made sure it's proper, but it still gives the error.

• I am using the .com region and choose the same in connector as well.
• I am using Airbyte Cloud
• Yes, Test connection is passed I have added the screenshot below

[priyank-atspark]

Here is my observations:
The Zoho Billing sync was failing because Airbyte refreshes the OAuth access token concurrently for each stream. With 12 streams, this triggered Zoho's token endpoint rate limit ("You have made too many requests continuously"), causing a 400 error and 0 rows synced. The rate limit is account-level (not per-app) and requires ~5-10 minutes of zero requests to clear.

Streams | Result
2 | Succeeded (504 rows)
6 | Succeeded (4,266 rows)
8 | Succeeded (11,981 rows)
10 | Failed (0 rows)
12 | Failed (0 rows)