> ## Documentation Index
> Fetch the complete documentation index at: https://docs.mailerpath.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Bulk upsert contacts from CSV

> Insert or update contacts from a CSV upload, up to the configured bulk import limit (default 1000). Rows are processed independently and reuse the same bulk upsert rules as the JSON endpoint. Source is always set to import.



## OpenAPI

````yaml /openapi.json post /client/contacts/bulk/csv
openapi: 3.0.1
info:
  title: MailerPath API
  description: This is the API for MailerPath, a service for managing and sending emails.
  termsOfService: http://swagger.io/terms/
  contact:
    name: API Support
    url: http://www.swagger.io/support
    email: support@swagger.io
  license:
    name: Apache 2.0
    url: http://www.apache.org/licenses/LICENSE-2.0.html
  version: 1.38.0
servers:
  - url: https://api.mailerpath.com/api/v1
security: []
paths: {}

````