openapi: 3.1.0
info:
  title: BILL v3 Authentication Customers API
  description: 'REST API providing access to BILL''s Accounts Payable, Accounts Receivable,

    and Spend & Expense capabilities — bills, invoices, vendors, customers,

    payments, funding accounts, organizations, webhooks, and authentication

    workflows.


    Best-effort OpenAPI reconstruction from BILL''s public developer portal at

    https://developer.bill.com/docs/home. Authoritative reference and Postman

    collection live under https://developer.bill.com/reference and

    https://developer.bill.com/llms.txt.

    '
  version: 3.0.0
  contact:
    name: BILL Developer Portal
    url: https://developer.bill.com/docs/home
  license:
    name: Proprietary
servers:
- url: https://gateway.prod.bill.com/connect/v3
  description: BILL production gateway (Connect v3)
- url: https://gateway.stage.bill.com/connect/v3
  description: BILL sandbox gateway (Connect v3)
- url: https://api.bill.com/v3
  description: BILL production API
- url: https://api-sandbox.bill.com/v3
  description: BILL sandbox API
security:
- sessionAuth: []
tags:
- name: Customers
paths:
  /customers:
    get:
      tags:
      - Customers
      summary: List customers
      operationId: listCustomers
      responses:
        '200':
          description: Customers.
    post:
      tags:
      - Customers
      summary: Create a customer
      operationId: createCustomer
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/CustomerCreate'
      responses:
        '201':
          description: Created customer.
  /customers/{customerId}:
    parameters:
    - name: customerId
      in: path
      required: true
      schema:
        type: string
    get:
      tags:
      - Customers
      summary: Retrieve a customer
      operationId: getCustomer
      responses:
        '200':
          description: Customer.
    patch:
      tags:
      - Customers
      summary: Update a customer
      operationId: updateCustomer
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/CustomerCreate'
      responses:
        '200':
          description: Updated customer.
  /customers/{customerId}/bank-accounts:
    parameters:
    - name: customerId
      in: path
      required: true
      schema:
        type: string
    post:
      tags:
      - Customers
      summary: Add a customer bank account
      operationId: addCustomerBankAccount
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/BankAccount'
      responses:
        '201':
          description: Added.
components:
  schemas:
    BankAccount:
      type: object
      required:
      - routingNumber
      - accountNumber
      - accountType
      properties:
        routingNumber:
          type: string
        accountNumber:
          type: string
        accountType:
          type: string
          enum:
          - CHECKING
          - SAVINGS
        nameOnAccount:
          type: string
        verified:
          type: boolean
    CustomerCreate:
      type: object
      required:
      - name
      properties:
        name:
          type: string
        email:
          type: string
          format: email
        phone:
          type: string
        billingAddress:
          $ref: '#/components/schemas/Address'
        shippingAddress:
          $ref: '#/components/schemas/Address'
        accountNumber:
          type: string
        balance:
          type: number
          format: double
        currency:
          type: string
    Address:
      type: object
      properties:
        line1:
          type: string
        line2:
          type: string
        city:
          type: string
        stateOrProvince:
          type: string
        zipOrPostalCode:
          type: string
        country:
          type: string
  securitySchemes:
    sessionAuth:
      type: apiKey
      in: header
      name: sessionId
      description: 'Session identifier obtained from `POST /login`. Expires after 35 minutes

        of inactivity. A `devKey` (developer key) is also required on requests

        and is sent alongside `sessionId` in the appropriate header per BILL''s

        official reference.

        '