> ## Documentation Index > Fetch the complete documentation index at: https://docs.upwell.com/llms.txt > Use this file to discover all available pages before exploring further. # Create Many Bills > Create multiple bills at once ## OpenAPI ````yaml /api-reference/openapi.json post /api/rest/bulk-bills openapi: 3.1.0 info: description: >- Upwell is Accounts Receivable automation software for the logistics industry. We serve freight brokers, carriers, factors, and anyone who needs to get transportation invoices paid. Learn more at: - [Upwell.com](https://upwell.com) title: Upwell REST API version: 3.30.2 termsOfService: https://upwell.com/legal contact: name: Upwell url: https://upwell.com email: contact@upwell.com servers: - url: https://api.upwell.com description: Production server - url: https://staging.api.upwell.com description: Staging server security: [] tags: - name: Invoice Approval description: Endpoints for managing customer invoice approval workflow paths: /api/rest/bulk-bills: post: tags: - Bills summary: Create Many Bills description: Create multiple bills at once parameters: - description: >- Your API key will be used for authentication of the request. `Authorization: YOUR_API_KEY` in: header name: authorization schema: type: string requestBody: content: application/json: schema: properties: inputs: items: $ref: '#/components/schemas/BillsInsertInput' nullable: false type: array type: object description: >- Query parameters can also be provided in the request body as a JSON object required: true responses: '200': content: application/json: schema: properties: createBills: description: response of any mutation on the table "bills" nullable: true properties: returning: items: description: columns and relationships of "bills" nullable: false properties: billLineItems: items: description: columns and relationships of "bill_line_items" nullable: false properties: createdAt: $ref: '#/components/schemas/timestamptz' description: nullable: true title: String type: string id: nullable: false title: String type: string item: nullable: true title: String type: string lineNumber: nullable: false title: String type: string quantity: $ref: '#/components/schemas/numeric' sourceSystem: nullable: true title: String type: string sourceSystemId: nullable: true title: String type: string totalAmount: nullable: true title: Int type: integer unitPrice: nullable: true title: Int type: integer updatedAt: $ref: '#/components/schemas/timestamptz' title: BillLineItems type: object nullable: false type: array carrierId: nullable: false title: String type: string checkOrAchNumber: nullable: true title: String type: string createdAt: $ref: '#/components/schemas/timestamptz' currency: $ref: '#/components/schemas/CurrencyCodeEnum' dueDate: nullable: true title: String type: string id: nullable: false title: String type: string issueDate: nullable: true title: String type: string notes: nullable: true title: String type: string payToAccount: nullable: true title: String type: string proNumber: nullable: false title: String type: string referenceNumber: nullable: true title: String type: string sourceSystem: nullable: false title: String type: string sourceSystemId: nullable: true title: String type: string sourceSystemMeta: $ref: '#/components/schemas/jsonb' status: nullable: true title: String type: string terms: nullable: true title: String type: string totalAmount: nullable: false title: Int type: integer updatedAt: $ref: '#/components/schemas/timestamptz' vendor: description: Vendors nullable: true properties: createdAt: $ref: '#/components/schemas/timestamptz' id: nullable: false title: String type: string name: nullable: false title: String type: string sourceSystem: nullable: false title: String type: string sourceSystemId: nullable: false title: String type: string sourceSystemMeta: $ref: '#/components/schemas/jsonb' updatedAt: $ref: '#/components/schemas/timestamptz' title: Vendors type: object vendorId: nullable: true title: String type: string title: Bills type: object nullable: false type: array title: BillsMutationResponse type: object description: Responses for POST /api/rest/bulk-bills components: schemas: BillsInsertInput: description: input type for inserting data into table "bills" nullable: false properties: billLineItems: type: object description: BillLineItemsArrRelInsertInput (simplified) billLineItemsLastUpdatedAt: $ref: '#/components/schemas/timestamptz' carrierId: nullable: true title: String type: string checkOrAchNumber: nullable: true title: String type: string createdAt: $ref: '#/components/schemas/timestamptz' currency: $ref: '#/components/schemas/CurrencyCodeEnum' dispatcherEmail: nullable: true title: String type: string dueDate: nullable: true title: String type: string id: nullable: true title: String type: string issueDate: nullable: true title: String type: string mcleodSettlementTransferError: nullable: true title: String type: string mcleodSettlementTransferResponse: $ref: '#/components/schemas/jsonb' mcleodSettlementTransferredAt: $ref: '#/components/schemas/timestamptz' notes: nullable: true title: String type: string payToAccount: nullable: true title: String type: string proNumber: nullable: true title: String type: string referenceNumber: nullable: true title: String type: string sourceSystem: nullable: true title: String type: string sourceSystemId: nullable: true title: String type: string sourceSystemMeta: $ref: '#/components/schemas/jsonb' status: nullable: true title: String type: string terms: nullable: true title: String type: string totalAmount: nullable: true title: Int type: integer updatedAt: $ref: '#/components/schemas/timestamptz' vendor: type: object description: VendorsObjRelInsertInput (simplified) vendorId: nullable: true title: String type: string title: BillsInsertInput type: object timestamptz: nullable: false title: timestamptz type: string format: date-time description: >- A timestamp with timezone in ISO 8601 format, such as 2024-12-16T21:57:14.525733+00:00 numeric: nullable: false title: numeric CurrencyCodeEnum: enum: - AED - AUD - BRL - CAD - CHF - CNY - EGP - EUR - GBP - HKD - IDR - INR - JPY - KRW - MXN - MYR - NZD - QAR - SAR - SGD - THB - TRY - TWD - USD - VND - ZAR nullable: false title: CurrencyCodeEnum jsonb: nullable: false title: jsonb ````