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openapi: 3.2.0
info:
title: Treasury Management API (via Kong Gateway) Payments API
version: v1
description: "# Treasury Management API - Kong Gateway Documentation\n\n## Overview\n\nThe Treasury Management API provides endpoints for managing loan inventory, disbursements, payments, and treasury operations.\nThis API is accessed through Kong Gateway, which handles authentication via OAuth2.\n\n## Authentication\n\nAll requests to this API require OAuth2 authentication through Kong Gateway.\n\n### Step 1: Get OAuth2 Token\n\nBefore calling any endpoint, you must obtain an access token:\n\n**QA Environment:**\n```bash\ncurl -X POST https://api.lkeyqa.com/TreasuryMgmtQa/oauth2/token \\\n -d \"grant_type=client_credentials\" \\\n -d \"client_id=YOUR_CLIENT_ID\" \\\n -d \"client_secret=YOUR_CLIENT_SECRET\"\n```\n\n**DEV Environment:**\n```bash\ncurl -X POST https://api.lkeyqa.com/TreasuryMgmtDev/oauth2/token \\\n -d \"grant_type=client_credentials\" \\\n -d \"client_id=YOUR_CLIENT_ID\" \\\n -d \"client_secret=YOUR_CLIENT_SECRET\"\n```\n\n**Staging Environment:**\n```bash\ncurl -X POST https://api.lkeystaging.com/TreasuryMgmt/oauth2/token \\\n -d \"grant_type=client_credentials\" \\\n -d \"client_id=YOUR_CLIENT_ID\" \\\n -d \"client_secret=YOUR_CLIENT_SECRET\"\n```\n\n**Production Environment:**\n```bash\ncurl -X POST https://api.lendkey.com/TreasuryMgmt/oauth2/token \\\n -d \"grant_type=client_credentials\" \\\n -d \"client_id=YOUR_CLIENT_ID\" \\\n -d \"client_secret=YOUR_CLIENT_SECRET\"\n```\n\n**Response:**\n```json\n{\n \"access_token\": \"eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...\",\n \"token_type\": \"bearer\",\n \"expires_in\": 7200\n}\n```\n\n### Step 2: Use Token in API Calls\n\nInclude the access token in the `Authorization` header:\n```\nAuthorization: Bearer YOUR_ACCESS_TOKEN\n```\n\n**Token Lifetime:** 2 hours (7200 seconds)\n\n## Base URLs (Kong Gateway)\n\n| Environment | Kong Base URL | Backend OutSystems URL |\n|------------|---------------|------------------------|\n| **DEV** | `https://api.lkeyqa.com/TreasuryMgmtDev` | `https://lendkey-dev.outsystemsenterprise.com` |\n| **QA** | `https://api.lkeyqa.com/TreasuryMgmtQa` | `https://os.lkeyqa.com` |\n| **Staging** | `https://api.lkeystaging.com/TreasuryMgmt` | `https://os.lkeystaging.com` |\n| **Production** | `https://api.lendkey.com/TreasuryMgmt` | `https://os.lendkey.com` |\n\n**Note:** Route names are case-insensitive (`/TreasuryMgmt`, `/treasurymgmt`, `/TREASURYMGMT` all work)\n\n## How Kong Routes Requests\n\nWhen you call Kong:\n```\nhttps://api.lkeyqa.com/TreasuryMgmtQa/v1/createLoan\n```\n\nKong:\n1. Validates your OAuth2 token\n2. Strips the `/TreasuryMgmtQa` prefix\n3. Adds OutSystems authentication headers (X-Auth-Key, X-Auth-AppId)\n4. Forwards to: `https://os.lkeyqa.com/TreasuryManagement_API/rest/v1/createLoan`\n\nYou never need to manage OutSystems credentials directly!\n\n## Getting Started\n\n1. **Get Credentials:** Contact your Kong admin or use the Kong Developer Portal\n2. **Get Token:** Use the OAuth2 token endpoint for your environment\n3. **Call API:** Use the token in the Authorization header\n4. **Refresh:** Get a new token every 2 hours\n"
contact:
name: LendKey Platform Team
url: https://lendkey.com
servers:
- url: https://api.lendkey.com/TreasuryMgmt
description: Production Environment
security:
- oauth2: []
tags:
- name: Payments
description: Payment and remittance processing
paths:
/v1/createPayment:
post:
summary: Create Payment
description: 'Inserts payment/remittance data for loan obligations.
Use this endpoint to record payments made against loans, including:
- Interest payments
- Principal payments
- Late fees
- Other charges
**Kong Route:** `/v1/createPayment`
**Backend:** `/TreasuryManagement_API/rest/v1/createPayment`
'
tags:
- Payments
operationId: createPayment
requestBody:
required: true
content:
application/json:
schema:
$ref: '#/components/schemas/CreatePaymentRequest'
examples:
principalPayment:
summary: Principal payment
value:
subledgerCategory: Payment
isSubledgerReversal: false
subledgerItemCode: PRINCIPAL
paymentId: PMT-2025-001
payorEntityType: Borrower
amount: 1000.0
loanExternalId: LOAN-12345
purpose: Monthly principal payment
interestPayment:
summary: Interest payment
value:
subledgerCategory: Payment
isSubledgerReversal: false
subledgerItemCode: INTEREST
paymentId: PMT-2025-002
payorEntityType: Borrower
amount: 150.0
loanExternalId: LOAN-12345
purpose: Monthly interest payment
lateFeePayment:
summary: Late fee payment
value:
subledgerCategory: Payment
isSubledgerReversal: false
subledgerItemCode: Late Fee
paymentId: PMT-2025-003
payorEntityType: Borrower
amount: 25.0
loanExternalId: LOAN-12345
purpose: Late payment fee
responses:
'200':
description: Payment successfully created
content:
application/json:
schema:
$ref: '#/components/schemas/CreatePaymentResponse'
'207':
description: Multi-status (partial success)
content:
application/json:
schema:
$ref: '#/components/schemas/CreatePaymentResponse'
'400':
description: Bad request (validation errors)
content:
application/json:
schema:
$ref: '#/components/schemas/ErrorResponse'
'401':
description: Unauthorized (invalid or expired token)
content:
application/json:
schema:
$ref: '#/components/schemas/ErrorResponse'
'500':
description: Internal server error
content:
application/json:
schema:
$ref: '#/components/schemas/ErrorResponse'
components:
schemas:
CreatePaymentResponse:
type: object
properties:
isSuccess:
type: boolean
description: Overall success indicator
example: true
statusCode:
type: integer
description: HTTP status code (200, 207, 400, 500)
example: 200
responseDetails:
type: array
items:
type: object
properties:
paymentId:
type: string
description: Payment identifier
example: PMT-2025-001
errors:
type: array
description: Array of error messages (if any)
items:
type: string
CreatePaymentRequest:
type: object
required:
- subledgerCategory
- isSubledgerReversal
- subledgerItemCode
- paymentId
- payorEntityType
- amount
- loanExternalId
properties:
subledgerCategory:
type: string
enum:
- Payment
description: Subledger category (must be "Payment")
example: Payment
isSubledgerReversal:
type: boolean
description: Whether this is a reversal transaction
example: false
subledgerItemCode:
type: string
enum:
- INTEREST
- PRINCIPAL
- Late Fee
- NSF Fee
- Other
description: Type of payment
example: PRINCIPAL
paymentId:
type: string
description: Unique payment identifier
example: PMT-2025-001
payorEntityType:
type: string
description: Type of entity making payment (e.g., Borrower)
example: Borrower
amount:
type: number
format: double
description: Payment amount
example: 1000.0
loanExternalId:
type: string
description: External loan identifier
example: LOAN-12345
purpose:
type: string
description: Optional payment purpose/description
example: Monthly principal payment
ErrorResponse:
type: object
properties:
isSuccess:
type: boolean
description: Success indicator (always false for errors)
example: false
statusCode:
type: integer
description: HTTP status code
example: 400
error:
type: string
description: Error message
example: Invalid request
errors:
type: array
description: Detailed error messages
items:
type: string
example:
- Field 'loanUUID' is required
- Field 'amount' must be greater than 0
securitySchemes:
oauth2:
type: oauth2
description: OAuth2 client credentials flow via Kong Gateway
flows:
clientCredentials:
tokenUrl: /oauth2/token
scopes: {}