> For the complete documentation index, see [llms.txt](https://docs.omypayments.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.omypayments.com/api/common-issues.md).

# Common issues

This section addresses some common issues and their solutions.

#### 1. API Key Not Working

**Problem:** You receive an error message such as `Missing api key` or `Invalid api key`. **Solution:**

* Ensure that your API key is correctly included in the `apiKey` header.
* Verify that you have copied the API key accurately from your account dashboard at [https://dashboard.omypayments.com/](https://dashboard.omypayments.com/site/login).
* Check that the API key has not expired or been revoked.

#### 2. Invoice Not Updating

**Problem:** The invoice status does not change after its creation. **Solution:**

* Confirm that the payment has been made and confirmed on the blockchain.
* Verify that the Callback URL is correctly configured and is receiving status updates.
* Ensure that your system correctly processes incoming callbacks.

#### 3. Callback Not Received

**Problem:** Your server is not receiving webhook callbacks. **Solution:**

* Check that your server endpoint is publicly accessible and returns a `200` status code.
* Ensure that no firewall or network restrictions block incoming requests.
* Verify that the Callback URL is correctly registered in your merchant settings.