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Support

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Technical support

For integration questions, API issues, or troubleshooting, contact the Flex Forward team: Email: [email protected] When reporting an issue, include the following to help us resolve it quickly:
  • Environment (production or development)
  • Endpoint called (e.g., POST /labels)
  • Label ID (if applicable)
  • Request timestamp (ISO 8601 format)
  • HTTP status code received
  • Error response body (full JSON)
A request correlation header (X-Request-Id) is planned for a future release. Once available, include it in issue reports for faster resolution.
For production-impacting issues, include [PRODUCTION] in your email subject line so the team can prioritize accordingly.

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Onboarding and account setup

For API access requests, shipper account configuration, or carrier enablement, contact us at the same email address. The onboarding process:
1

Request API access

Email the Flex Forward team with your use case and expected shipping volume.
2

Receive credentials

You will receive API tokens for the development and production environments, along with your shipper account configuration.
3

Test in development

Use the development environment to validate your integration against courier sandbox services.
4

Go live

Once testing is complete, switch to the production base URL and production credentials.

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Frequently asked questions

Email [email protected] with your use case. The team will provision development and production credentials for your account.
YunExpress is currently enabled for production shipments, supporting global cross-border e-commerce shipping lanes. Additional carriers are enabled based on shipping lane requirements and account onboarding. Contact the team to discuss carrier availability for your integration.
Yes. The development environment (https://sandbox.flexforward.com) connects to courier sandbox services for safe testing. See Environments for details.
Use the idempotencyKey field in POST /labels. The same key always returns the same result without creating a new label. See Idempotency and Retries for details.
Label documents are available as PDF or PNG. The GET /labels/{id} endpoint returns a download URL and the document format. See the API Reference for the full response schema.
Webhooks are not currently available. Use GET /tracking/{id} to poll for tracking status updates. Contact the team if you have a use case that requires push-based notifications.
Tracking checkpoint timestamps (checkpointTime) are returned in UTC (ISO 8601 format with Z suffix).