> ## Documentation Index
> Fetch the complete documentation index at: https://baas-api-docs.rexmfbank.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Transfer to another bank

> Sends funds out to an account at another financial institution over the NIP switch.



## OpenAPI

````yaml /openapi.yaml post /services/virtual-account/interbank-transfer
openapi: 3.1.0
info:
  title: Rex Banking-as-a-Service API
  version: 1.0.0
  summary: Embed real bank accounts, transfers, and collections into your product.
  description: |
    The Rex BaaS API lets you provision virtual bank accounts, move money
    between them, accept inbound transfers, and collect at merchant terminals —
    all under your own brand, backed by a real bank ledger.

    This reference covers every endpoint your integration will call. If
    you're just getting started, read **[Getting Started](/introduction)**
    and **[Authentication](/authentication)** first — most integration
    questions are answered there, not in the endpoint list.

    All endpoints are versioned under `/baas/api/v1` and return JSON. See
    **[Errors](/errors)** for the shared error envelope, and
    **[Sandbox vs. Live](/guides/sandbox-vs-live)** for how test and
    production credentials differ.
  contact:
    name: Rex BaaS Support
    email: baas-support@rexmfbank.com
  license:
    name: Proprietary — for approved Rex BaaS partners only
servers:
  - url: https://api.rexmfbank.com/baas/api/v1
    description: Live
  - url: https://sandbox-api.rexmfbank.com/baas/api/v1
    description: Sandbox
security:
  - BearerAuth: []
tags:
  - name: Authentication
    description: Register a partner account, verify it, log in, and manage credentials.
  - name: Onboarding
    description: |
      The one-time KYB (Know Your Business) flow every partner completes
      before going live — business details, a compliance representative,
      supporting documents, and signing the partner agreement.
  - name: Wallet
    description: >-
      Your business's own settlement balance — the account every virtual account
      nets into.
  - name: Virtual Accounts
    description: |
      The core product — dedicated bank account numbers you issue to your
      own end users, with full transfer and transaction capabilities.
  - name: Webhooks
    description: Configure where and how Rex notifies your system of events in real time.
  - name: Partner Settings
    description: >-
      Account security, team members, disputes, and document management for your
      own partner account.
paths:
  /services/virtual-account/interbank-transfer:
    post:
      tags:
        - Virtual Accounts
      summary: Transfer to another bank
      description: >-
        Sends funds out to an account at another financial institution over the
        NIP switch.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
                - sourceAccountNo
                - beneficiaryAccountNo
                - beneficiaryBankCode
                - beneficiaryName
                - amount
                - narration
                - reference
              properties:
                sourceAccountNo:
                  type: string
                beneficiaryAccountNo:
                  type: string
                beneficiaryBankCode:
                  type: string
                  maxLength: 10
                beneficiaryName:
                  type: string
                  maxLength: 100
                amount:
                  type: number
                  format: float
                  minimum: 0.01
                narration:
                  type: string
                  maxLength: 100
                reference:
                  type: string
                  maxLength: 191
                geolocation:
                  type: string
                  nullable: true
                charge:
                  type: number
                  nullable: true
                stampDuty:
                  type: number
                  nullable: true
                channel:
                  type: string
                  nullable: true
      responses:
        '200':
          description: OK
          content:
            application/json:
              example:
                status: success
                message: Interbank transfer SUCCESSFUL.
                data:
                  reference: REF-002
                  transactionStatus: SUCCESSFUL
        '400':
          description: >-
            `INSUFFICIENT_BALANCE`, or `TRANSFER_FAILED` with the provider's own
            reason
        '404':
          description: '`SOURCE_ACCOUNT_NOT_FOUND`'
        '409':
          description: '`DUPLICATE_REFERENCE` or `FBO_NOT_PROVISIONED`'
components:
  securitySchemes:
    BearerAuth:
      type: http
      scheme: bearer
      bearerFormat: sk_live_... / sk_sandbox_...
      description: |
        See **[Authentication](/authentication)** for the full explanation
        of session tokens vs. API keys and when each is used.

````