> ## Documentation Index
> Fetch the complete documentation index at: https://docs.niobi.co/llms.txt
> Use this file to discover all available pages before exploring further.

# Payment Method Type is Wrong or Missing

## Overview

**400 - Bad Request**:  This error occurs when the payment method type in the request payload is either missing or does not match any of the supported payment method types for the specified country.

```json theme={null}
{
    "success": false,
    "message": "Payment method type is wrong or missing."
}
```

## Common Causes and How to Resolve

1. **Invalid Payment Method Type:**:
   The value provided in the `payment_method_type` field is not recognized or supported.

   **How To Resolve**: Confirm that the `payment_method_type` value matches one of the supported payment method types listed in the API reference for the different countries. You can find the full list [here](/countries-v4).

2. **Spelling or Case Sensitivity Issues**:
   The value of the `payment_method_type` field contains typographical errors or is in the wrong case. For example, a payment method like Mtn, may need to be passed as MTN, Mtn or mtn depending on the request type.

   **How to Resolve**: Double-check the spelling and casing of the `payment_method_type` field to ensure it matches the expected format. You can find the list of payment method types for collections [here](/api-reference/payment-link/unified-collections) and for disbursements [here](/api-reference/payment/niobi-unified-payment-version-3).

***

## Best Practices

* **Reference Supported Payment Methods:**
  * Always refer to the Payment Method Types provided under the api reference for either deposits or disbursements.

* **Validate Input Data:**
  * Always ensure you pass the payment method in the correct case and spelling.

***

If the issue persists, please contact our team at [support@niobi.co](mailto:support@niobi.co).

***

## Additional Resources

* [Supported Countries](/countries-v4)
* [Collection API Reference](/api-reference/payment-link/unified-collections)
* [Disbursements API Reference](/api-reference/payment/niobi-unified-payment-version-3)