# Claims
source: https://developer.mastercard.com/mastercom-extended/documentation/use_cases/createclaim/index.md

## Overview {#overview}

The overview demonstrates the process of an issuer or acquirer creating or retrieving claims and claim details.

For more information, refer to the [Claims](https://developer.mastercard.com/mastercom-extended/tutorial/claims/index.md) tutorial.
Note: In the following graphics, optional steps are denoted with dashed arrows instead of solid arrows. Diagram claim_over

**Step 1:** The issuer or acquirer creates a claim for the selected transaction.  

If a claim has previously been created in Mastercom v6 for a transaction, an attempted Mastercom Extended Claim Creation API call (POST /claims) will yield an error message indicating a claim has already been created for this transaction in the Mastercom v6 system.  

**Step 2-optional:** The issuer or acquirer retrieves details for an existing claim.  

**Step 3-optional:** The issuer or acquirer retrieves a list of claims.  

## Create a claim {#create-a-claim}

Issuers and acquirers use this endpoint to create a new claim.
Diagram claim_create
API Reference: `POST /claims`

## Retrieve a list of claims {#retrieve-a-list-of-claims}

Issuers and acquirers use this endpoint to retrieve a list of claims.
Diagram claim_retlist
API Reference: `POST /claims/searches`

## Retrieve details for an existing claim {#retrieve-details-for-an-existing-claim}

Issuers and acquirers use this endpoint to retrieve details for an existing claim.
Diagram claim_retdetails
API Reference: `GET /claims/{claim_id}`