> ## Documentation Index > Fetch the complete documentation index at: https://docs.paypal.ai/llms.txt > Use this file to discover all available pages before exploring further. # Dispute reasons and evidence You can determine what evidence to provide for a dispute or chargeback based on its reason. To defend a dispute or chargeback effectively: 1. Use the Show dispute details response to determine the required evidence. The `reason` and `evidences.evidence_type` parameters denote the dispute reason and the evidence type respectively. 2. Use the Provide evidence endpoint to submit the evidence to PayPal. Each dispute reason requires specific evidence that helps PayPal review and resolve the case. The following sections list the dispute reasons and the required evidence for each reason. ### MERCHANDISE\_OR\_SERVICE\_NOT\_RECEIVED The buyer did not receive the merchandise or service. | Evidence type | Required evidence | | ---------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | | `PROOF_OF_FULFILLMENT` | Provide one of the following to PayPal: | | `PROOF_OF_REFUND` | Pass the refund ID in the `evidences.evidence_info.refund_ids` parameter. | ### MERCHANDISE\_OR\_SERVICE\_NOT\_AS\_DESCRIBED The buyer reports that the merchandise or service was not as described. | Evidence type | Required evidence | | ----------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | `OTHER` | Pass the notes or documents in the `evidences.notes` or `evidences.documents` parameters respectively. For example, you can include a product description, item URL, return policy, or a copy of a contract or an affidavit. | | `PROOF_OF_REFUND` | Pass the refund ID in the `evidences.evidence_info.refund_ids` parameter. | ### UNAUTHORISED The buyer did not authorize purchase of the merchandise or service. | Evidence type | Required evidence | | ---------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | `PROOF_OF_FULFILLMENT` | Provide the carrier name and tracking number through `evidences.evidence_info.tracking_info.carrier_name` and `evidences.evidence_info.tracking_info.tracking_number` parameters respectively. | | `PROOF_OF_REFUND` | Pass the refund ID in the `evidences.evidence_info.refund_ids` parameter. | | `OTHER` | Pass the notes or documents in the `evidences.notes` or `evidences.documents` parameters respectively. For example, a document can be a proof of delivery signature or a proof of receipt copy. | ### CREDIT\_NOT\_PROCESSED The refund or credit transaction was not processed for the buyer. | Evidence type | Required evidence | | ----------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------- | | `PROOF_OF_REFUND` | Pass the refund ID in the `evidences.evidence_info.refund_ids` parameter. | | `OTHER` | Pass the notes or documents in the `evidences.notes` or `evidences.documents` parameters respectively. For example, a document can be a credit due reason. | ### DUPLICATE\_TRANSACTION The transaction was a duplicate. | Evidence type | Required evidence | | ----------------- | ------------------------------------------------------------------------------------------------------ | | `PROOF_OF_REFUND` | Pass the refund ID in the `evidences.evidence_info.refund_ids` parameter. | | `OTHER` | Pass the notes or documents in the `evidences.notes` or `evidences.documents` parameters respectively. | ### INCORRECT\_AMOUNT The buyer was charged an incorrect amount. | Evidence type | Required evidence | | ----------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------- | | `PROOF_OF_REFUND` | Pass the refund ID in the `evidences.evidence_info.refund_ids` parameter for the difference in amount. | | `OTHER` | Pass the notes or documents in the `evidences.notes` or `evidences.documents` parameters respectively. For example, a document can be a price difference reason. | ### PAYMENT\_BY\_OTHER\_MEANS The buyer paid for the transaction through other means. | Evidence type | Required evidence | | ----------------- | ------------------------------------------------------------------------------------------------------ | | `PROOF_OF_REFUND` | Pass the refund ID in the `evidences.evidence_info.refund_ids` parameter for the difference in amount. | | `OTHER` | Pass the notes or documents in the `evidences.notes` or `evidences.documents` parameters respectively. | ### CANCELED\_RECURRING\_BILLING The buyer was incorrectly charged after canceling the subscription or recurring billing. | Evidence type | Required evidence | | ----------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------- | | `PROOF_OF_REFUND` | Pass the refund ID in the `evidences.evidence_info.refund_ids` parameter for the difference in amount. | | `OTHER` | Pass the notes or documents in the `evidences.notes` or `evidences.documents` parameters respectively. For example, a document can be a subscription agreement. | ### OTHER | Evidence type | Required evidence | | ----------------- | ------------------------------------------------------------------------------------------------------ | | `PROOF_OF_REFUND` | Pass the refund ID in the `evidences.evidence_info.refund_ids` parameter. | | `OTHER` | Pass the notes or documents in the `evidences.notes` or `evidences.documents` parameters respectively. |