---
title: "Perform a mass action"
method: POST
path: "/v1/bulk"
tags: ["Mass Updater"]
---

# Perform a mass action

`POST /v1/bulk`

Describes how to perform a mass action through the REST API. 

Using this API method, you send a multipart/form-data request containing a `.csv` file with data about the mass action you want to perform. Zuora returns a key and then asynchronously processes the mass action. You can use the key to get details about the result of the mass action.

If you want to use this operation to perform the Mass Payment Upload (MPU) mass action, see [Mass Payment Upload](https://knowledgecenter.zuora.com/Billing/Finance/Mass_Updater/Mass_Payment_Upload) for more information.

## Headers

- `Idempotency-Key` string
- `Accept-Encoding` string
- `Content-Encoding` string
- `Zuora-Track-Id` string
- `Zuora-Entity-Ids` string
- `Zuora-Org-Ids` string
- `Zuora-Version` string

## Response `200`

OK

- POSTMassUpdateResponseType
  - `bulkKey` string — String of 32 characters that identifies the mass action. The bulkKey is generated before the mass action is processed. You can use the bulkKey to Get the Mass Action Result.
  - `success` boolean — Returns `true` if the request was processed successfully.

## Other responses

- `500` — Internal Server Error
- `4XX` — Request Errors

---

[API](https://skmtc.dev/zuora/apis/api-reference.md) · [All operations](https://skmtc.dev/zuora/apis/api-reference/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/zuora/api-reference/revisions/702f3caf3985/schema)