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

# Application Sources Overview

> Track referral channels and marketing campaigns that originate applications

Application sources identify the referral channel, partner, or campaign that originated an application. Each source can be associated with multiple applications, enabling attribution reporting and pipeline analysis by source.

| Endpoint                                                                            | Description                                                     |
| ----------------------------------------------------------------------------------- | --------------------------------------------------------------- |
| [List application sources](/api-reference/leads/list-lead-sources)                  | Retrieve all application sources                                |
| [Create application source](/api-reference/leads/create-lead-source)                | Create a new referral or campaign source                        |
| [Get application source](/api-reference/leads/get-lead-source)                      | Retrieve a single application source by ID                      |
| [Update application source](/api-reference/leads/update-lead-source)                | Update an existing application source                           |
| [Get source summary](/api-reference/leads/get-lead-source-summary)                  | Retrieve an aggregate summary for an application source         |
| [List applications for source](/api-reference/leads/list-leads-for-source)          | Retrieve all applications associated with an application source |
| [List sources for application](/api-reference/leads/list-lead-lead-sources)         | Retrieve all sources associated with an application             |
| [Add source to application](/api-reference/leads/add-lead-source-to-lead)           | Associate an application source with an application             |
| [Remove source from application](/api-reference/leads/remove-lead-source-from-lead) | Remove an application source association from an application    |