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

# Filing Requirements

> Required fields and documentation for each dispute type and card network

Depending on dispute reason and card network, different fields and documentation must be present when you call the file endpoint for a case. Missing values produce a `400` response with `parameter_missing` or `documentation_missing` errors. This reference lists, per network, the requirements for each dispute type. Evidence beyond these requirements is also recommended, see [Dispute Types](/dispute-types).

## Mastercard

### Required fields

| Reason                                                         | Required fields                                                                                                                                   |
| -------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------- |
| <span style={{whiteSpace: 'nowrap'}}>`fraud`</span>            | `issuer_evidence.card.is_active` (must be `false`); at least one of `issuer_evidence.fraud.was_reported` or `issuer_evidence.fraud.submit_report` |
| <span style={{whiteSpace: 'nowrap'}}>`incorrect_amount`</span> | `issuer_evidence.amount_correction.amount`, `issuer_evidence.amount_correction.currency`                                                          |

### Required documentation

| Reason                                                         | Required file category |
| -------------------------------------------------------------- | ---------------------- |
| <span style={{whiteSpace: 'nowrap'}}>`incorrect_amount`</span> | `transaction_receipt`  |

## Visa

### Required fields

| Reason                                                                 | Required fields                                                                                                                                   |
| ---------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------- |
| <span style={{whiteSpace: 'nowrap'}}>`fraud`</span>                    | `issuer_evidence.card.is_active` (must be `false`); at least one of `issuer_evidence.fraud.was_reported` or `issuer_evidence.fraud.submit_report` |
| <span style={{whiteSpace: 'nowrap'}}>`product_not_received`</span>     | `issuer_evidence.delivery.expected_date`, `issuer_evidence.merchant_contact.date`                                                                 |
| <span style={{whiteSpace: 'nowrap'}}>`subscription_canceled`</span>    | `issuer_evidence.cancellation.date`, `issuer_evidence.merchant_contact.date`                                                                      |
| <span style={{whiteSpace: 'nowrap'}}>`product_not_as_described`</span> | `issuer_evidence.delivery.date`, `issuer_evidence.merchant_contact.date`                                                                          |
| <span style={{whiteSpace: 'nowrap'}}>`credit_not_processed`</span>     | `issuer_evidence.refund.promise_date`                                                                                                             |
| <span style={{whiteSpace: 'nowrap'}}>`incorrect_amount`</span>         | `issuer_evidence.amount_correction.amount`, `issuer_evidence.amount_correction.currency`                                                          |
| <span style={{whiteSpace: 'nowrap'}}>`product_counterfeit`</span>      | `issuer_evidence.delivery.date`                                                                                                                   |
| <span style={{whiteSpace: 'nowrap'}}>`canceled_or_returned`</span>     | `issuer_evidence.delivery.date` or `issuer_evidence.delivery.expected_date`, `issuer_evidence.merchant_contact.date`                              |

### Required documentation

| Reason                                                             | Required file category                                                                                  |
| ------------------------------------------------------------------ | ------------------------------------------------------------------------------------------------------- |
| <span style={{whiteSpace: 'nowrap'}}>`credit_not_processed`</span> | `refund_promise` (credit transaction receipt, voided transaction receipt, or other proof of credit due) |
| <span style={{whiteSpace: 'nowrap'}}>`incorrect_amount`</span>     | `transaction_receipt`                                                                                   |
| <span style={{whiteSpace: 'nowrap'}}>`product_counterfeit`</span>  | `counterfeit_evidence` (e.g. photo of counterfeit item, third-party verification)                       |

## American Express

### Required fields

| Reason                                                         | Required fields                                                                                                                                   |
| -------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------- |
| <span style={{whiteSpace: 'nowrap'}}>`fraud`</span>            | `issuer_evidence.card.is_active` (must be `false`); at least one of `issuer_evidence.fraud.was_reported` or `issuer_evidence.fraud.submit_report` |
| <span style={{whiteSpace: 'nowrap'}}>`incorrect_amount`</span> | `issuer_evidence.amount_correction.amount`, `issuer_evidence.amount_correction.currency`                                                          |

### Required documentation

| Reason                                                         | Required file category |
| -------------------------------------------------------------- | ---------------------- |
| <span style={{whiteSpace: 'nowrap'}}>`incorrect_amount`</span> | `transaction_receipt`  |

For the full list of recommended evidence per dispute type, see the [Dispute Types](/dispute-types) documentation. For filing windows and earliest-filing dates, see [Filing Timelines](/filing-timelines).