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

# Get Gateway Transaction

> Returns detail for a single NMI gateway transaction.



## OpenAPI

````yaml GET /api/partner/merchants/{merchant_id}/gateway-transactions/{gateway_txn_id}
openapi: 3.0.3
info:
  title: Partner API
  description: External API for ISO partners to access merchant data, pricing, and reports
  version: 0.1.0
servers: []
security: []
paths:
  /api/partner/merchants/{merchant_id}/gateway-transactions/{gateway_txn_id}:
    get:
      tags:
        - Gateway Transactions
        - Gateway Transactions
      summary: Get gateway transaction
      description: Returns detail for a single NMI gateway transaction.
      operationId: >-
        get_gateway_transaction_api_partner_merchants__merchant_id__gateway_transactions__gateway_txn_id__get
      parameters:
        - name: merchant_id
          in: path
          required: true
          schema:
            type: string
            minLength: 1
            maxLength: 50
            description: Merchant ID
            title: Merchant Id
          description: Merchant ID
          example: '1234567890'
        - name: gateway_txn_id
          in: path
          required: true
          schema:
            type: string
            minLength: 1
            maxLength: 100
            description: Gateway transaction ID
            title: Gateway Txn Id
          description: Gateway transaction ID
      responses:
        '200':
          description: Successful Response
          content:
            application/json:
              schema: {}
        '401':
          description: Missing or invalid API key
        '403':
          description: Merchant not in portfolio or insufficient scope
        '404':
          description: Transaction not found
        '422':
          description: Validation Error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/HTTPValidationError'
        '429':
          description: Rate limit exceeded
        '503':
          description: Gateway transaction service unavailable
components:
  schemas:
    HTTPValidationError:
      properties:
        detail:
          items:
            $ref: '#/components/schemas/ValidationError'
          type: array
          title: Detail
      type: object
      title: HTTPValidationError
    ValidationError:
      properties:
        loc:
          items:
            anyOf:
              - type: string
              - type: integer
          type: array
          title: Location
        msg:
          type: string
          title: Message
        type:
          type: string
          title: Error Type
      type: object
      required:
        - loc
        - msg
        - type
      title: ValidationError

````