# Validation error (/api/rest/troubleshooting/rest_validation_error)



Returns from the Orders v2 or Payments v1 APIs.

> **Info:** **Note:** If an issue persists or if you have further questions, you can reach out to
> [paypal-techsupport.com](https://www.paypal-techsupport.com).

## Cause [#cause]

This error occurs when a payment attempt fails due to invalid or incomplete data in the API request. Common causes include:

* **Invalid or missing fields**: Required fields are missing or contain incorrect values.
* **Incorrect data types**: Field values do not match expected data types.
* **Currency issues**: Currency codes are invalid or the amount formatting is incorrect.
* **Invalid JSON**: The request body is not properly formatted as JSON.
* **Business rules**: The transaction is blocked based on the account's status or configuration.
* **API version conflicts**: An incorrect or outdated API version is used. Some validation rules may change between versions.

## Impact [#impact]

The payment process is halted, preventing the buyer from finalizing their purchase. This can lead to lost sales if the issue is not resolved promptly.

## Resolution [#resolution]

* **Review the error details**: Check the error response from the API to identify the exact field and issue.
* **Validate your data**: Ensure all required fields are present. Verify that each field contains valid data and matches the expected format and type.
* **Fix the data and retry**: Update the request with correct data and resend it. This should allow the payment to process and the customer to complete their purchase.