# Collaboration (Issuer Use Case)
source: https://developer.mastercard.com/mastercom/documentation/use-cases/collaboration_issuer/index.md

## Collaboration (Issuer Use Case) {#collaboration-issuer-use-case}

The following use case demonstrates the process of Collaboration, an attempt to engage the merchant to resolve the dispute. The Collaboration process is part of the process of creating a first chargeback.
Diagram collaborationIssuer

1. (Issuer) [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 *Rejects* queue.


API Reference: `POST /v6/queues`

2. **OPTIONAL STEP** : (Issuer) [Retrieve claim](https://developer.mastercard.com/mastercom/documentation/test-cases/test-cases/index.md#retrieve-claim) to retrieve data for a specific claim and its associated first chargeback, in order to check the reject details.


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

3. **OPTIONAL STEP** : (Issuer) [Update chargeback](https://developer.mastercard.com/mastercom/documentation/test-cases/test-cases/index.md#update-chargeback) to update the chargeback accepting or rejecting the Merchant voucher (in the case that the Merchant offers a voucher instead of a refund).


API Reference: `PUT /v6/claims/{claim-id}/chargebacks/{chargeback-id}`