openapi: 3.1.0
info:
  title: BILL v3 Authentication Bills 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: Bills
paths:
  /bills:
    get:
      tags:
      - Bills
      summary: List bills
      operationId: listBills
      parameters:
      - $ref: '#/components/parameters/Max'
      - $ref: '#/components/parameters/Page'
      - name: filters
        in: query
        schema:
          type: string
      responses:
        '200':
          description: Bills.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BillList'
    post:
      tags:
      - Bills
      summary: Create a bill
      operationId: createBill
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/BillCreate'
      responses:
        '201':
          description: Created bill.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Bill'
  /bills/bulk:
    post:
      tags:
      - Bills
      summary: Create multiple bills in one request
      operationId: createBillsBulk
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
              - bills
              properties:
                bills:
                  type: array
                  items:
                    $ref: '#/components/schemas/BillCreate'
      responses:
        '200':
          description: Bulk creation result.
  /bills/{billId}:
    parameters:
    - $ref: '#/components/parameters/BillId'
    get:
      tags:
      - Bills
      summary: Retrieve a bill
      operationId: getBill
      responses:
        '200':
          description: Bill.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Bill'
    patch:
      tags:
      - Bills
      summary: Update a bill
      operationId: updateBill
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/BillCreate'
      responses:
        '200':
          description: Updated bill.
  /bills/{billId}/archive:
    parameters:
    - $ref: '#/components/parameters/BillId'
    post:
      tags:
      - Bills
      summary: Archive a bill
      operationId: archiveBill
      responses:
        '200':
          description: Archived.
components:
  schemas:
    BillLineItem:
      type: object
      properties:
        id:
          type: string
        amount:
          type: number
          format: double
        chartOfAccountId:
          type: string
        departmentId:
          type: string
        locationId:
          type: string
        description:
          type: string
        lineType:
          type: string
        quantity:
          type: number
        unitPrice:
          type: number
          format: double
    BillCreate:
      type: object
      required:
      - vendorId
      - invoiceNumber
      - invoiceDate
      - dueDate
      - billLineItems
      properties:
        vendorId:
          type: string
        invoiceNumber:
          type: string
        invoiceDate:
          type: string
          format: date
        dueDate:
          type: string
          format: date
        description:
          type: string
        billLineItems:
          type: array
          items:
            $ref: '#/components/schemas/BillLineItem'
    Bill:
      type: object
      properties:
        id:
          type: string
        invoiceNumber:
          type: string
        invoiceDate:
          type: string
          format: date
        dueDate:
          type: string
          format: date
        amount:
          type: number
          format: double
        amountDue:
          type: number
          format: double
        currency:
          type: string
        vendorId:
          type: string
        description:
          type: string
        approvalStatus:
          type: string
        paymentStatus:
          type: string
        archived:
          type: boolean
        billLineItems:
          type: array
          items:
            $ref: '#/components/schemas/BillLineItem'
        createdTime:
          type: string
          format: date-time
        updatedTime:
          type: string
          format: date-time
    BillList:
      type: object
      properties:
        results:
          type: array
          items:
            $ref: '#/components/schemas/Bill'
        nextPage:
          type: string
  parameters:
    Max:
      name: max
      in: query
      schema:
        type: integer
        default: 100
        maximum: 999
    BillId:
      name: billId
      in: path
      required: true
      schema:
        type: string
    Page:
      name: page
      in: query
      schema:
        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.

        '