# Get payment applications

List all invoice applications for a payment.

Endpoint: GET /payments/{id}/applications
Version: 1.0.0
Security: BearerAuth

## Path parameters:

  - `id` (string, required)
    Resource ID (UUID) or client key
    Example: "550e8400-e29b-41d4-a716-446655440000"

## Query parameters:

  - `by` (string)
    Specify lookup type for faster retrieval.
If omitted, defaults to looking up by ID first, then falls back to client key if not found.
Use by=key when you know you're providing a client key for best performance.
    Enum: "id", "key"

## Response 200 fields (application/json):

  - `data` (array)

  - `data.id` (string, required)

  - `data.invoiceId` (string, required)

  - `data.invoiceFriendlyId` (string,null)

  - `data.invoiceAmount` (number,null)
    Total invoice amount

  - `data.invoiceOpenBalance` (number,null)
    Invoice balance before this payment

  - `data.amount` (number, required)
    Amount applied to this invoice

  - `totalApplied` (number)

## Response 401 fields (application/json):

  - `error` (string, required)
    Error code

  - `message` (string, required)
    Human-readable error message

## Response 404 fields (application/json):

  - `error` (string, required)
    Error code

  - `message` (string, required)
    Human-readable error message