> ## 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 One Invoice > Create a new invoice. **Integration notes:** - `POST` errors with `400 Uniqueness violation` on duplicate `(sourceSystem, sourceSystemId)`. Use `PUT` for updates. - `balance` is `NOT NULL` with no server-side default — for a new invoice it should equal `totalAmount`. - `totalAmount` (and other monetary fields) are integer cents, not float dollars. - The invoice number field is `number` (not `invoiceNumber`) and the issue date is `issueDate` (not `invoiceDate`). See [Integration patterns](/integration-patterns). ## OpenAPI ````yaml /api-reference/openapi.json post /api/rest/invoices 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/invoices: post: tags: - Invoices summary: Create One Invoice description: >- Create a new invoice. **Integration notes:** - `POST` errors with `400 Uniqueness violation` on duplicate `(sourceSystem, sourceSystemId)`. Use `PUT` for updates. - `balance` is `NOT NULL` with no server-side default — for a new invoice it should equal `totalAmount`. - `totalAmount` (and other monetary fields) are integer cents, not float dollars. - The invoice number field is `number` (not `invoiceNumber`) and the issue date is `issueDate` (not `invoiceDate`). See [Integration patterns](/integration-patterns). 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: input: $ref: '#/components/schemas/InvoicesInsertInput' 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: createInvoice: description: columns and relationships of "invoices" nullable: true properties: balance: $ref: '#/components/schemas/bigint' companyDivision: nullable: true title: String type: string createdAt: $ref: '#/components/schemas/timestamptz' customerId: nullable: true title: String type: string customerReferenceNumber: nullable: true title: String type: string dueDate: $ref: '#/components/schemas/date' id: nullable: false title: String type: string invoiceLineItems: items: description: columns and relationships of "invoice_line_items" nullable: false properties: createdAt: $ref: '#/components/schemas/timestamptz' id: nullable: false title: String type: string item: nullable: true title: String type: string remoteId: nullable: true title: String type: string sourceSystem: nullable: true title: String type: string sourceSystemId: nullable: true title: String type: string totalAmount: nullable: true title: Int type: integer updatedAt: $ref: '#/components/schemas/timestamptz' title: InvoiceLineItems type: object nullable: false type: array invoiceShipments: items: description: columns and relationships of "invoice_shipments" nullable: false properties: shipment: description: columns and relationships of "shipments" nullable: false properties: consigneeAddress: description: columns and relationships of "addresses" nullable: true properties: city: nullable: true title: String type: string companyName: nullable: true title: String type: string country: $ref: '#/components/schemas/CountryCodeEnum' id: nullable: false title: String type: string name: nullable: true title: String type: string phoneNumber: nullable: true title: String type: string stateOrProvince: nullable: true title: String type: string streetLine1: nullable: true title: String type: string streetLine2: nullable: true title: String type: string zipOrPostalCode: nullable: true title: String type: string title: Addresses type: object createdAt: $ref: '#/components/schemas/timestamptz' currency: $ref: '#/components/schemas/CurrencyCodeEnum' customerId: nullable: true title: String type: string deliveredAt: $ref: '#/components/schemas/timestamp' id: nullable: false title: String type: string invoiceId: nullable: true title: String type: string loadDescription: nullable: true title: String type: string pickupAddress: description: columns and relationships of "addresses" nullable: true properties: city: nullable: true title: String type: string companyName: nullable: true title: String type: string country: $ref: '#/components/schemas/CountryCodeEnum' id: nullable: false title: String type: string name: nullable: true title: String type: string phoneNumber: nullable: true title: String type: string stateOrProvince: nullable: true title: String type: string streetLine1: nullable: true title: String type: string streetLine2: nullable: true title: String type: string zipOrPostalCode: nullable: true title: String type: string title: Addresses type: object pickupAt: $ref: '#/components/schemas/timestamp' shipmentId: nullable: false title: String type: string status: nullable: true title: String type: string stops: items: description: columns and relationships of "stops" nullable: false properties: address: description: columns and relationships of "addresses" nullable: true properties: city: nullable: true title: String type: string companyName: nullable: true title: String type: string country: $ref: '#/components/schemas/CountryCodeEnum' id: nullable: false title: String type: string name: nullable: true title: String type: string phoneNumber: nullable: true title: String type: string stateOrProvince: nullable: true title: String type: string streetLine1: nullable: true title: String type: string streetLine2: nullable: true title: String type: string zipOrPostalCode: nullable: true title: String type: string title: Addresses type: object id: nullable: false title: String type: string metadata: nullable: true title: String type: string pieceCount: nullable: true title: Int type: integer sequenceNumber: nullable: true title: Int type: integer stopType: nullable: true title: String type: string weightAmount: $ref: '#/components/schemas/float8' weightUnit: nullable: true title: String type: string title: Stops type: object nullable: false type: array trailerNumber: nullable: true title: String type: string updatedAt: $ref: '#/components/schemas/timestamptz' volume: $ref: '#/components/schemas/float8' volumeUnit: nullable: true title: String type: string weight: $ref: '#/components/schemas/float8' weightUnit: nullable: true title: String type: string title: Shipments type: object title: InvoiceShipments type: object nullable: false type: array issueDate: $ref: '#/components/schemas/date' metadata: $ref: '#/components/schemas/jsonb' missingDocuments: nullable: true title: String type: string number: nullable: false title: String type: string portalSlug: nullable: true title: String type: string referenceNumbers: $ref: '#/components/schemas/jsonb' sourceSystem: nullable: true title: String type: string sourceSystemId: nullable: true title: String type: string status: $ref: '#/components/schemas/InvoiceStatusEnum' totalAmount: $ref: '#/components/schemas/bigint' totalTaxAmount: $ref: '#/components/schemas/bigint' updatedAt: $ref: '#/components/schemas/timestamptz' title: Invoices type: object description: Responses for POST /api/rest/invoices components: schemas: InvoicesInsertInput: description: input type for inserting data into table "invoices" nullable: false properties: approvedToSend: nullable: true title: Boolean type: boolean balance: $ref: '#/components/schemas/bigint' description: >- The balance of the invoice. This should be in cents. For example, $100.00 should be represented as 10000. billOfLadingNumber: nullable: true title: String type: string billToCustomer: type: object description: CustomersObjRelInsertInput (simplified) billToCustomerId: nullable: true title: String type: string carrierProNumber: nullable: true title: String type: string checkOrAchNumber: nullable: true title: String type: string companyDivision: nullable: true title: String type: string createdFromEmailMessageId: nullable: true title: String type: string customerId: nullable: true title: String type: string customerPoNumber: nullable: true title: String type: string customerReferenceNumber: nullable: true title: String type: string debitsUpdatedAt: $ref: '#/components/schemas/timestamp' deliveryDate: $ref: '#/components/schemas/date' documentExceptions: $ref: '#/components/schemas/jsonb' dueDate: $ref: '#/components/schemas/date' exceptions: type: object description: ExceptionsArrRelInsertInput (simplified) externallyManaged: nullable: true title: Boolean type: boolean fileAssociations: type: object description: FileAssociationsArrRelInsertInput (simplified) fileAssociationsUpdatedAt: $ref: '#/components/schemas/timestamp' finalCheckPassedAt: $ref: '#/components/schemas/timestamptz' invoiceErrors: type: object description: InvoiceErrorsArrRelInsertInput (simplified) invoiceLineItems: type: object description: InvoiceLineItemsArrRelInsertInput (simplified) invoicePriorityActions: type: object description: InvoicePriorityActionsArrRelInsertInput (simplified) invoiceSnooze: type: object description: InvoiceSnoozesObjRelInsertInput (simplified) invoiceSnoozes: type: object description: InvoiceSnoozesArrRelInsertInput (simplified) issueDate: $ref: '#/components/schemas/date' lastUpdatedByEmailMessageId: nullable: true title: String type: string lineItemsLastUpdatedAt: $ref: '#/components/schemas/timestamptz' listBillDeliveryInvoices: type: object description: ListBillDeliveryInvoicesArrRelInsertInput (simplified) metadata: $ref: '#/components/schemas/jsonb' number: nullable: true title: String type: string paidDate: $ref: '#/components/schemas/timestamptz' paymentLineItems: type: object description: PaymentLineItemsArrRelInsertInput (simplified) portalException: nullable: true title: String type: string portalInvoiceStatuses: type: object description: PortalInvoiceStatusesArrRelInsertInput (simplified) portalSlug: nullable: true title: String type: string receivedAt: $ref: '#/components/schemas/timestamp' receivedFromPortalSlug: nullable: true title: String type: string referenceNumbers: $ref: '#/components/schemas/jsonb' scacCode: nullable: true title: String type: string scheduledPaymentDate: $ref: '#/components/schemas/date' sentAt: $ref: '#/components/schemas/timestamp' sentToPortalSlug: nullable: true title: String type: string shipDate: $ref: '#/components/schemas/date' sourceSystem: nullable: true title: String type: string sourceSystemId: nullable: true title: String type: string splitLineage: type: object description: InvoiceSplitLineageObjRelInsertInput (simplified) status: $ref: '#/components/schemas/InvoiceStatusEnum' enum: - created - open - sent - viewed - paid - part-paid - disputed - overdue - cancelled - write-off - refunded - send-error supportingDocPacketBuiltAgainstAt: $ref: '#/components/schemas/timestamp' totalAmount: $ref: '#/components/schemas/bigint' description: >- The total amount of the invoice. This should be in cents. For example, $100.00 should be represented as 10000. totalTaxAmount: $ref: '#/components/schemas/bigint' description: >- The total tax amount of the invoice. This should be in cents. For example, $100.00 should be represented as 10000. title: InvoicesInsertInput type: object bigint: nullable: false title: bigint 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 date: nullable: false title: date type: string format: date description: A date string, such as 2024-02-03 (YYYY-MM-DD) CountryCodeEnum: enum: - AD - AE - AF - AG - AL - AM - AO - AR - AT - AU - AZ - BA - BB - BD - BE - BF - BG - BH - BI - BJ - BN - BO - BR - BS - BT - BW - BY - BZ - CA - CD - CF - CG - CH - CI - CL - CM - CN - CO - CR - CU - CV - CY - CZ - DE - DJ - DK - DM - DO - DZ - EC - EE - EG - ER - ES - ET - FI - FJ - FM - FR - GA - GB - GD - GE - GH - GM - GN - GQ - GR - GT - GW - GY - HK - HN - HR - HT - HU - ID - IE - IL - IN - IQ - IR - IS - IT - JM - JO - JP - KE - KG - KH - KI - KM - KN - KP - KR - KW - KZ - LA - LB - LC - LI - LK - LR - LS - LT - LU - LV - LY - MA - MC - MD - ME - MG - MH - MK - ML - MM - MN - MO - MR - MT - MU - MV - MW - MX - MY - MZ - NA - NE - NG - NI - NL - 'NO' - NP - NR - NZ - OM - PA - PE - PG - PH - PK - PL - PR - PS - PT - PW - PY - QA - RO - RS - RU - RW - SA - SB - SC - SD - SE - SG - SI - SK - SL - SM - SN - SO - SR - SS - ST - SV - SY - SZ - TD - TG - TH - TJ - TL - TM - TN - TO - TR - TT - TV - TW - TZ - UA - UG - US - UY - UZ - VA - VC - VE - VN - VU - WS - YE - ZA - ZM - ZW nullable: false title: CountryCodeEnum 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 timestamp: nullable: false title: timestamp float8: nullable: false title: float8 jsonb: nullable: false title: jsonb InvoiceStatusEnum: enum: - APPROVED - CANCELLED - CREATED - DELIVERED - DISPUTED - DRAFT - OPEN - OVERDUE - PAID - PART_PAID - PORTAL_EXCEPTION - PORTAL_RESOLVED - PROCESSING - REFUNDED - REJECTED - SEND_ERROR - SENT - VIEWED - WRITE_OFF nullable: false title: InvoiceStatusEnum ````