iBanFirst Webhook subscriptions API

openapi: 3.2.0
info:
  version: 1.6.0
  title: iBanFirst Webhook subscriptions API
  description: "iBanFirst API for cross-border payments, FX trades, account management, beneficiaries, and webhooks.\n\n**Try it out in Postman:** [View Postman Collection](https://www.postman.com/productibf/ibanfirst-rest-api-workspace/collection/d24hl8d/ibanfirst-rest-api?action=share&creator=44872188)\n\n---\n\n## Authentication — X-WSSE\n\nEvery request must include an `X-WSSE` header. Plain HTTP calls will fail. The token is **stateless and expires after ~5 minutes**, so it must be computed fresh for each request.\n\n### Header format\n\n```\nX-WSSE: UsernameToken Username=\"<username>\", PasswordDigest=\"<digest>\", Nonce=\"<nonce_b64>\", Created=\"<timestamp>\"\n```\n\n### Fields\n\n| Field | Description |\n|---|---|\n| `Username` | The username assigned during onboarding. |\n| `Nonce` | A Base64-encoded random hex string (≥ 32 hex characters). |\n| `Created` | Current UTC timestamp in ISO 8601: `YYYY-MM-DDTHH:MM:SSZ`. |\n| `PasswordDigest` | `Base64( SHA-1( nonce_bytes ∥ created_bytes ∥ secret_bytes ) )` — SHA-1 **binary** digest, then Base64. |\n\n### Algorithm (step-by-step)\n\n1. Generate a random nonce: at least 32 lowercase hexadecimal characters (e.g. `d36e3162829ed4c89851497a717f0001`).\n2. Get the current UTC timestamp as an ISO-8601 string (e.g. `2026-05-12T10:30:00Z`).\n3. Encode the nonce string as UTF-8 bytes, the timestamp as UTF-8 bytes, and the API secret as UTF-8 bytes.\n4. Compute `SHA-1( nonce_bytes + created_bytes + secret_bytes )`. The hash **must** be the raw binary digest (not hex).\n5. `PasswordDigest` = `Base64( sha1_binary_digest )`\n6. `Nonce` = `Base64( nonce_utf8_bytes )`\n\n### Code samples\n\n**Python**\n```python\nimport base64, hashlib, os, binascii\nfrom datetime import datetime, timezone\n\ndef generate_xwsse(username: str, secret: str) -> str:\n    nonce = binascii.b2a_hex(os.urandom(16))          # 32 hex bytes\n    created = datetime.now(timezone.utc).strftime(\"%Y-%m-%dT%H:%M:%SZ\")\n    digest = base64.b64encode(\n        hashlib.sha1(nonce + created.encode() + secret.encode()).digest()\n    ).decode()\n    nonce_b64 = base64.b64encode(nonce).decode()\n    return f'UsernameToken Username=\"{username}\", PasswordDigest=\"{digest}\", Nonce=\"{nonce_b64}\", Created=\"{created}\"'\n```\n\n**JavaScript (Node.js)**\n```javascript\nconst crypto = require('crypto');\nfunction generateXWSSE(username, secret) {\n    const nonce = crypto.randomBytes(16);\n    const created = new Date().toISOString();\n    const digest = crypto.createHash('sha1')\n        .update(nonce)\n        .update(Buffer.from(created))\n        .update(Buffer.from(secret))\n        .digest('base64');\n    return `UsernameToken Username=\"${username}\", PasswordDigest=\"${digest}\", Nonce=\"${nonce.toString('base64')}\", Created=\"${created}\"`;\n}\n```\n\n**PHP**\n```php\nfunction generateXWSSE(string $username, string $secret): string {\n    $nonce = bin2hex(random_bytes(16));          // 32 hex chars\n    $created = gmdate('Y-m-d\\TH:i:s\\Z');\n    $digest = base64_encode(sha1($nonce . $created . $secret, true));\n    return sprintf('UsernameToken Username=\"%s\", PasswordDigest=\"%s\", Nonce=\"%s\", Created=\"%s\"',\n        $username, $digest, base64_encode($nonce), $created);\n}\n```\n\n### Environments\n\n| Environment | Base URL |\n|---|---|\n| Demo (testing) | `https://api-demo.ibanfirst.com/api` |\n| Live (production) | `https://api.ibanfirst.com/api` |\n\n### Forbidden characters in input fields\n\nThe following characters are rejected in route parameters, query parameters, and JSON bodies: `&` `<` `>` `%` `?` `\\` `/` `|`"
servers:
- url: https://api-demo.ibanfirst.com/api
security:
- X-WSSE: []
tags:
- name: Webhook subscriptions
  description: "**1. WHAT IS A WEBHOOK ?**\n\n - Webhooks are events based real-time notifications providing updates on transactions and removing the need for periodic polling.\n\n - Webhook notifications are sent as HTTPS POST requests to a URL of your choice.\n\n**2. WEBHOOK SUBSCRIPTIONS**\n\n - Each webhook subscription allows you to receive notifications for one or more event types :\n\n   -  **Outgoing payment :**`PAYMENT_PLANIFIED` `PAYMENT_FINALIZED` `PAYMENT_WAITING_SIGNATURE` `PAYMENT_AWAITING_CONFIRMATION` `PAYMENT_CANCELED` `PAYMENT_BLOCKED` `PAYMENT_WAITING_JUSTIFICATION` `PAYMENT_INCOMING`\n\n   -  **Spot trade** : `TRADE_PLANIFIED` `TRADE_FINALIZED` `TRADE_CANCELED` `TRADE_BLOCKED`\n\n - You may have up to 10 active subscriptions at the same time.\n\n **3. IMPLEMENTATION**\n\n - **Delivery and retries**\n   -  Webhook notifications may not be delivered in order, your implementation should not assume sequential delivery.\n   - If a notification delivery fails (HTTP status code 400 or 500), it will be retried twice, with a 60-second delay between attempts. This results in a maximum of three delivery attempts per event.\n - **Acknowledgement**\n   - We recommend responding with a HTTP `204` code (No Content) to acknowledge receipt of a notification.\n  - **Whitelisting**\n    - To ensure webhook notifications reach your URL, you may need to whitelist the following IP (production and demo): **51.158.86.1**. \n\n**4. SECURITY**\n\n- Each webhook notification includes an HMAC-256 signature in the request header to let you **validate its authenticity**.\n  -  To verify the signature, recontruct the signed message by concatenating the exact timestamp and request raw body as received : `x-ibanfirst-timestamp.{Body}`.\n    - Compute an HMAC-SHA256 hash of this string using the subscription secret key and compare the result with the `x-ibanfirst-signature` provided in the notification header.\n    - You must **reject** the notification if the signatures do not match.\n -  Recommended best practices :\n    - Always validate the signature before processing any webhook notification.\n    - Webhook notification payloads must be stored on a private server to protect sensitive data.\n\n**5. WEBHOOK NOTIFICATION CONTENT**\n\n Notifications contain the relevant object as described in each reconciliation service.\n - [Get payment details](https://docs.ibanfirst.com/api/clientapi/payments/paths/~1payments~1%7Bid%7D/get)\n - [Get trade detail](https://docs.ibanfirst.com/api/clientapi/trades/paths/~1trades~1%7Bid%7D/get)\n\n```json\n{\n \"event\": event_label,\n \"payload\": {\n    see get payment details, get trade details\n },\n\"webhookId\": \"e35b6e8d-67ef-4973-945d-c3190a60d0aa\"\n}\n```"
paths:
  /webhooks:
    post:
      summary: Create webhook subscription
      tags:
      - Webhook subscriptions
      description: "You can subscribe to one or more events.\n\n **Note :** Please save the issued secret as it cannot be retrieved again."
      requestBody:
        content:
          application/json:
            schema:
              type: object
              required:
              - events
              - url
              properties:
                events:
                  $ref: '#/components/schemas/events'
                url:
                  $ref: '#/components/schemas/url'
        required: true
      responses:
        '200':
          description: OK
          content:
            application/json:
              schema:
                type: object
                properties:
                  webhookId:
                    $ref: '#/components/schemas/webhookId'
                  events:
                    $ref: '#/components/schemas/events'
                  secret:
                    type: string
                    pattern: ^[A-Za-z0-9]{32,64}$
                  url:
                    $ref: '#/components/schemas/url'
        default:
          description: ERROR
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
    get:
      summary: Get webhook subscriptions list
      tags:
      - Webhook subscriptions
      description: 'Retrieve the list of your webhook subscriptions.

        '
      responses:
        '200':
          description: OK
          content:
            application/json:
              schema:
                type: array
                description: An array containing a list of your webhooks and details.
                items:
                  $ref: '#/components/schemas/Webhook'
        default:
          description: ERROR
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
  /webhooks/{webhookId}:
    get:
      summary: Get webhook subscription details
      tags:
      - Webhook subscriptions
      description: 'Retrieve the details of a specific webhook subscription.

        '
      parameters:
      - name: webhookId
        in: path
        description: 'The ID of the webhook subscription.

          '
        required: true
        schema:
          type: string
      responses:
        '200':
          description: OK
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Webhook'
        default:
          description: ERROR
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
    patch:
      summary: Update webhook subscription
      tags:
      - Webhook subscriptions
      description: You can update the list of subscribed events and/or the url notifications are sent to.
      parameters:
      - name: webhookId
        in: path
        description: 'The ID of the webhook subscription you want to update.

          '
        required: true
        schema:
          type: string
      requestBody:
        content:
          application/json:
            schema:
              type: object
              properties:
                events:
                  $ref: '#/components/schemas/events'
                url:
                  $ref: '#/components/schemas/url'
        required: true
      responses:
        '200':
          description: OK
          content:
            application/json:
              schema:
                type: object
                properties:
                  webhookId:
                    $ref: '#/components/schemas/webhookId'
                  events:
                    $ref: '#/components/schemas/events'
                  url:
                    $ref: '#/components/schemas/url'
        default:
          description: ERROR
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
    delete:
      summary: Cancel webhook subscription
      tags:
      - Webhook subscriptions
      description: Cancel a webhook subscription to stop receiving notifications.
      parameters:
      - name: webhookId
        in: path
        description: 'The ID of the webhook subscription you want to cancel.

          '
        required: true
        schema:
          type: string
      responses:
        '204':
          description: OK
        default:
          description: ERROR
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
  /webhooks/{webhookId}/rotate-secret:
    post:
      summary: Rotate secret
      tags:
      - Webhook subscriptions
      description: 'Ask for a new secret for a specific webhook subscription.

        '
      parameters:
      - name: webhookId
        in: path
        description: 'The ID of the webhook subscription.

          '
        required: true
        schema:
          type: string
      responses:
        '200':
          description: OK
          content:
            application/json:
              schema:
                type: object
                properties:
                  webhookId:
                    $ref: '#/components/schemas/webhookId'
                  events:
                    $ref: '#/components/schemas/events'
                  secret:
                    type: string
                    pattern: ^[A-Za-z0-9]{32,64}$
                  url:
                    $ref: '#/components/schemas/url'
        default:
          description: ERROR
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
  /webhooks/{webhookId}/failed-notifications:
    get:
      summary: Get failed notifications
      tags:
      - Webhook subscriptions
      description: "Retrieve the list of failed notifications for a given subscription.\n\n "
      parameters:
      - name: webhookId
        in: path
        description: 'The ID of the webhook subscription.

          '
        required: true
        schema:
          type: string
      - name: fromDate
        in: query
        description: 'The starting date to search for failed notifications.

          '
        required: false
        schema:
          type: string
          format: YYYY-MM-DD
      - name: toDate
        in: query
        description: 'The ending date to search for failed notifications.

          '
        required: false
        schema:
          type: string
          format: YYYY-MM-DD
      - name: page
        in: query
        description: 'Index of the page.

          '
        required: false
        schema:
          type: string
          default: '1'
      - name: per_page
        in: query
        description: Number of items returned per page.
        required: false
        schema:
          type: string
          default: '50'
      - name: sort
        in: query
        description: "Notifications are sorted by creation date. \n"
        required: false
        schema:
          type: string
          enum:
          - ASC
          - DESC
          default: DESC
      responses:
        '200':
          description: OK
          content:
            application/json:
              schema:
                type: object
                properties:
                  failedNotifications:
                    type: array
                    items:
                      $ref: '#/components/schemas/webhookFailedNotification'
                  totalCount:
                    description: Total count of failed notifications
                    type: string
                    example: '10'
                  page:
                    description: 'Index of the page.

                      '
                    type: string
                    example: '1'
                  perPage:
                    description: 'Number of items returned per page.

                      '
                    type: string
                    example: '50'
                  totalPages:
                    description: 'Number of pages.

                      '
                    type: string
                    example: '10'
        default:
          description: ERROR
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
components:
  schemas:
    url:
      type: string
      description: 'Notifications are sent to this url.

        '
      pattern: ^(https?:\/\/)[^\s/$.?#].[^\s]*$
      example: https:\www.notification.com
    events:
      type: array
      items:
        type: string
        enum:
        - PAYMENT_CREATED
        - PAYMENT_PLANIFIED
        - PAYMENT_FINALIZED
        - PAYMENT_WAITING_SIGNATURE
        - PAYMENT_AWAITING_CONFIRMATION
        - PAYMENT_CANCELED
        - PAYMENT_BLOCKED
        - PAYMENT_WAITING_JUSTIFICATION
        - PAYMENT_INCOMING
        - TRADE_PLANIFIED
        - TRADE_FINALIZED
        - TRADE_CANCELED
        - TRADE_BLOCKED
    Error:
      type: object
      description: 'Representation of an error.

        '
      properties:
        errorCode:
          type: number
          format: int
          description: 'The code referring the error.

            '
        errorType:
          type: string
          description: 'A short description identifying a general category for the error that occurred.

            '
        errorMessage:
          type: string
          description: Error description.
        link:
          type: string
          description: 'An hyperlink to access the page that describes more accurately the error.

            '
    webhookId:
      type: string
      pattern: ^[0-9a-fA-F]{8}(-[0-9a-fA-F]{4}){3}-[0-9a-fA-F]{12}$
      example: cf16243d-7e0a-4a5b-b996-ba7018201e30
      description: 'ID of the webhook subscription.

        '
    Webhook:
      type: object
      description: 'Representation of a webhook subscription.

        '
      properties:
        webhookId:
          $ref: '#/components/schemas/webhookId'
        events:
          description: 'List of subscribed events.

            '
          type: array
          items:
            $ref: '#/components/schemas/events'
        url:
          $ref: '#/components/schemas/url'
    webhookFailedNotification:
      type: object
      properties:
        id:
          description: Unique ID of a notification
          type: string
          pattern: ^[0-9a-fA-F]{8}(-[0-9a-fA-F]{4}){3}-[0-9a-fA-F]{12}$
          example: cf16243d-7e0a-4a5b-b996-ba7018201e30
        notificationContent:
          $ref: '#/components/schemas/notificationContent'
        errorMessage:
          description: ''
          type: string
        httpStatusCode:
          description: ''
          type: string
          example: '404'
        failedAt:
          type: string
          pattern: ''
          description: ''
        retryCount:
          description: ''
          type: integer
    notificationContent:
      type: object
      properties:
        payload:
          description: Content of the notification, see get payment details, get trade details
        eventType:
          type: string
          description: Event that triggered the notification.
        webhookId:
          $ref: '#/components/schemas/webhookId'
  securitySchemes:
    X-WSSE:
      type: apiKey
      in: header
      name: X-WSSE
      description: 'X-WSSE token-based authentication. The header value must be computed fresh for every request (tokens expire in ~5 minutes).


        Header value format:

        ```

        UsernameToken Username="<username>", PasswordDigest="<digest>", Nonce="<nonce_b64>", Created="<timestamp>"

        ```


        Algorithm:

        1. Generate a random nonce: ≥ 32 lowercase hex characters.

        2. Get current UTC timestamp in ISO 8601: `YYYY-MM-DDTHH:MM:SSZ`.

        3. Compute `PasswordDigest = Base64( SHA-1( nonce_bytes + created_bytes + secret_bytes ) )` — SHA-1 over the raw UTF-8 bytes concatenated in that order, result must be the binary digest before Base64 encoding.

        4. Compute `Nonce = Base64( nonce_utf8_bytes )`.


        See the `info.description` field at the top of this spec for full code samples in Python, JavaScript, PHP, Java, and Go.'