# Get past discount codes for contract

Retrieves historical discount codes that have been applied to or are associated with a specific membership contract. Returns discount details including code, value, usage limits, and expiration dates from Shopify.

Use Cases:
- Display discount history in customer portal
- Show applied promotional codes
- Track discount redemption for analytics
- Verify discount eligibility

Authentication: Requires API key authentication via X-API-Key header or api_key parameter

Endpoint: GET /api/external/v2/customer-discount-code-infos/get-past-discounts
Version: 0.0.1

## Query parameters:

  - `contractId` (integer, required)
    Subscription contract ID
    Example: 123456

  - `api_key` (string)
    API Key (Deprecated - Use Header X-API-Key instead)

## Header parameters:

  - `X-API-Key` (string)

## Response 200 fields (application/json):

  - `get__typename` (string)

## Response 401 fields (*/*):

  - `get__typename` (string)

## Response 403 fields (*/*):

  - `get__typename` (string)

## Response 404 fields (*/*):

  - `get__typename` (string)