# Collaboration After Acquirers Are Included
source: https://developer.mastercard.com/mastercom/documentation/use-cases/collaboration_acquirer/index.md

## Collaboration After Acquirers Are Included (Acquirer Use Case) {#collaboration-after-acquirers-are-included-acquirer-use-case}

The following use case demonstrates the process of Collaboration, an attempt to engage the merchant or acquirer to resolve the dispute prior to the completion of a first chargeback.
Diagram collaborationAcquirer

1. (Acquirer) [Retrieve claims from queue within date range](https://developer.mastercard.com/mastercom/documentation/test-cases/test-cases/index.md#retrieve-claims-from-queue-within-date-range) to retrieve claims from the AcquirerCollaborationUnworked queue.


API Reference: `POST /v6/queues`

2. (Acquirer) [Retrieve claim](https://developer.mastercard.com/mastercom/documentation/test-cases/test-cases/index.md#retrieve-claim) to retrieve data for a specific claim.


API Reference: `GET /v6/claims/{claim-id}`

3. **OPTIONAL STEP** : (Acquirer) [Retrieve clearing details](https://developer.mastercard.com/mastercom/documentation/test-cases/test-cases/index.md#retrieve-clearing-details) to request original transaction details.


API Reference: `GET /v6/claims/{claim-id}/transactions/clearing/{transaction-id}`

4. (Acquirer) [Acquirer fulfills a request](https://developer.mastercard.com/mastercom/documentation/test-cases/test-cases/index.md#acquirer-fulfill-a-request) to respond to a Collaboration request.


API Reference: `POST /v6/claims/{claim-id}/retrievalrequests/{request-id}/fulfillments`