> ## Documentation Index > Fetch the complete documentation index at: https://docs.tread.ai/llms.txt > Use this file to discover all available pages before exploring further. # Create an AddOn for a Company > Create an `AddOn` for a `Company` ## OpenAPI ````yaml /api-reference/openapi.json post /v1/companies/{company-id}/add_ons openapi: 3.0.3 info: title: Horizon API V1 version: '1.0' contact: name: Tread url: https://tread.io email: developers@tread.io description: >- This is the Version 1 implementation. When in doubt we default to the practices outlined [here](https://www.vinaysahni.com/best-practices-for-a-pragmatic-restful-api#advanced-queries) license: name: Private url: https://tread.io servers: - description: production url: https://api.tread-horizon.com security: - bearerAuth: [] tags: - name: Projects - name: Orders - name: Loads - name: Jobs - name: JobAssignments - name: ApprovalAssignments - name: Equipment - name: FuelSurcharges - name: Materials - name: Accounts - name: Tickets - name: Users - name: Sites - name: Companies - name: Departments - name: Rates - name: Services - name: EquipmentType - name: FileAttachments - name: MaterialType - name: LineItemType - name: DriverStateEvent - name: Authentication - name: IamRoles - name: Typeaheads - name: Integrations - name: Reflection - name: LoadCycles - name: AddOns - name: ServiceClass - name: Invoices - name: JobSummaries - name: LoadSummaries - name: CompanyShares - name: UserDevicePermission - name: Drivers - name: Settlements - name: LocationHistories - name: Telematics - name: OmniReports - name: DriverDays - name: Agave - name: AddOnCharges - name: ResourceUsageLogs - name: ResourceScopes - name: TravelledDistances - name: MaterialRates - name: CompanyDayJobStats - name: KMLFiles - name: AutoAddOnAssignments - name: SiteRateSchedules - name: TwilioIntegrations - name: Foremen - name: AccountExternalTruckIdentifier - name: GeofenceTriggers - name: Labels - name: Compliance - name: ComplianceDocuments paths: /v1/companies/{company-id}/add_ons: parameters: - schema: type: string name: company-id in: path required: true description: Company ID - $ref: '#/components/parameters/Accept-Language' post: tags: - AddOns summary: Create an AddOn for a Company description: Create an `AddOn` for a `Company` operationId: post-v1-companies-company-id-add_ons requestBody: content: application/json: schema: $ref: '#/components/schemas/AddOn-Create' responses: '201': description: Created content: application/json: schema: type: object required: - data properties: data: $ref: '#/components/schemas/AddOn-Read' '400': $ref: '#/components/responses/Error' '401': $ref: '#/components/responses/UnauthenticatedError' '403': $ref: '#/components/responses/Error' '406': $ref: '#/components/responses/Error' '415': $ref: '#/components/responses/Error' '422': $ref: '#/components/responses/ModelError' components: parameters: Accept-Language: name: Accept-Language in: header schema: type: string default: en example: en description: >- The Accept-Language request HTTP header indicates the natural language and locale that the client prefers. schemas: AddOn-Create: title: AddOn-Create x-stoplight: id: o1ksmtglap661 type: object required: - name - add_on_types properties: name: type: string x-stoplight: id: cl67dsx43nmu0 cost_rate_value: type: number x-stoplight: id: 8js81cp6tx9v8 description: The cost rate or buy price of the add on. nullable: true revenue_rate_value: type: number x-stoplight: id: 8bzixu62d0ste description: The revenue rate or sell price of the add on. revenue_cost_rate_type: $ref: '#/components/schemas/AddOnRateType' add_on_types: type: array x-stoplight: id: v579mppyl55o8 items: $ref: '#/components/schemas/AddOnType' quantity: type: number x-stoplight: id: hrcd34s69tbga external_id: type: string x-stoplight: id: nzp3xodjxp6hi nullable: true percentage: type: number x-stoplight: id: 7vjgltw0fe1mf description: '`RatePercentTotal` specific field' minimum: -100 maximum: 100 accounting_id: type: string x-stoplight: id: tq2drhrlerp5u nullable: true rate: type: number x-stoplight: id: v9fh5ndjeowwc deprecated: true description: Deprecated in favor of `revenue_rate_value`. add_on_rate_type: $ref: '#/components/schemas/AddOnRateType' deprecated: true description: Deprecated in favor of `revenue_cost_rate_type`. fuel_surcharge_schedule_id: type: string x-stoplight: id: rl4h6y4fwbfhc format: uuid nullable: true taxable: x-stoplight: id: f6h8j0m2n4q6s type: boolean default: false description: Whether this add-on is eligible for taxation additionalProperties: false AddOn-Read: title: AddOn-Read x-stoplight: id: pv5vims1nc6wu allOf: - $ref: '#/components/schemas/Identifier' - type: object required: - name - add_on_types - quantity - cost_rate_value - revenue_rate_value - revenue_cost_rate_type - external_id - percentage - company - accounting_id - rate - add_on_rate_type - taxable properties: name: type: string x-stoplight: id: qmldk5115vb6g add_on_types: type: array x-stoplight: id: 00d1prh7o0dn0 items: $ref: '#/components/schemas/AddOnType' quantity: type: string x-stoplight: id: etwqachefxyi2 cost_rate_value: type: string x-stoplight: id: 02z1yb6pwqgiw description: The cost rate or buy price of the add on nullable: true revenue_rate_value: type: string x-stoplight: id: pq16i16y4jqig description: The revenue rate or sell price of the add on revenue_cost_rate_type: $ref: '#/components/schemas/AddOnRateType' external_id: type: string x-stoplight: id: loqwlx3ud5ar3 nullable: true percentage: type: string x-stoplight: id: vv7o18vi8pzce company: $ref: '#/components/schemas/Company-Read-Nested' accounting_id: type: string x-stoplight: id: t76oqekhuly4n nullable: true rate: type: string x-stoplight: id: 3b7ro6cldcik7 deprecated: true description: Deprecated in favor of `revenue_rate_value`. add_on_rate_type: $ref: '#/components/schemas/AddOnRateType' deprecated: true description: Deprecated in favor of `revenue_cost_rate_type`. fuel_surcharge_schedule: $ref: '#/components/schemas/FuelSurchargeSchedule-Read-Nested' taxable: x-stoplight: id: u8w0y2b4d6g9i type: boolean default: false description: Whether this add-on is eligible for taxation - $ref: '#/components/schemas/Timestamps' AddOnRateType: title: AddOnRateType x-stoplight: id: 1c3m0qj0ofdao enum: - RateForEach - RatePercentOfTotal - PerLoad - FuelSurcharge example: RateForEach default: RateForEach AddOnType: title: AddOnType x-stoplight: id: d2h2dx8n8qui8 enum: - driver_pay - invoicing - job - settlement - driver_day example: driver_pay default: driver_pay Identifier: title: Identifier x-stoplight: id: gnd39lue5v7ol type: object required: - id properties: id: type: string x-stoplight: id: 2e38hjk4zd58m format: uuid additionalProperties: false Company-Read-Nested: title: Company-Read-Nested x-stoplight: id: cb2kn77qmf1l7 description: Compact Company model for nested reads. allOf: - $ref: '#/components/schemas/Identifier' x-stoplight: id: jwsufva4znm91 - $ref: '#/components/schemas/TreadId' - type: object properties: legal_name: type: string x-stoplight: id: yc10t8hieecwk description: The Company's name. Must be globally unique. company_type: $ref: '#/components/schemas/CompanyType' required: - legal_name - company_type FuelSurchargeSchedule-Read-Nested: title: FuelSurchargeSchedule-Read-Nested x-stoplight: id: cfxi1bfv03rdl allOf: - $ref: '#/components/schemas/Identifier' - type: object x-stoplight: id: ug5goi9re1abe required: - name properties: name: type: string x-stoplight: id: 2izdii9s4bcmr Timestamps: title: Timestamps x-stoplight: id: t82ecgfu0oj00 type: object required: - created_at - updated_at properties: created_at: type: string x-stoplight: id: gjj950jpq0ga9 format: date-time description: ISO8601 timestamp with local timezone updated_at: type: string x-stoplight: id: bwcuyfwc7aj0e format: date-time description: ISO8601 timestamp with local timezone additionalProperties: false Error-Response: title: Error-Response x-stoplight: id: 52cydhphee3qe type: object required: - error properties: error: $ref: '#/components/schemas/Error' additionalProperties: false UnauthenticatedError-Response: title: UnauthenticatedError-Response x-stoplight: id: o477eph7ttbzt type: object required: - error properties: error: $ref: '#/components/schemas/UnauthenticatedError' additionalProperties: false ModelError-Response: title: ModelError-Response x-stoplight: id: payf9ndh3l6np type: object required: - error properties: error: $ref: '#/components/schemas/ModelError' additionalProperties: false TreadId: title: TreadId x-stoplight: id: 43k4t5tl359m4 type: object required: - tread_id properties: tread_id: type: string x-stoplight: id: zi3ld7djflw6f pattern: ^[0-9A-F]{6}$ minLength: 6 maxLength: 6 example: ABC123 description: Tread ID additionalProperties: false CompanyType: title: CompanyType x-stoplight: id: dkzo7gjbtb1b3 enum: - broker - contractor - hauler - owner_operator - producer - super example: hauler description: Company Type Error: title: Error x-stoplight: id: 3g57kkik3l464 type: object description: An Error. required: - code properties: code: type: string x-stoplight: id: 7o9x1t8v0bgfo additionalProperties: false UnauthenticatedError: title: UnauthenticatedError x-stoplight: id: 202o69l0fs40h allOf: - $ref: '#/components/schemas/Error' - type: object x-stoplight: id: tg10dt7s0l6bw properties: error_type: type: string x-stoplight: id: wvq8c0qsym4hz required: - error_type ModelError: title: ModelError x-stoplight: id: nhp6714o4j1qt description: A Model-specific error allOf: - $ref: '#/components/schemas/Error' - type: object required: - errors properties: errors: type: array x-stoplight: id: m4ul9vcq2deh6 items: $ref: '#/components/schemas/ModelError-Item' ModelError-Item: title: ModelError-Item x-stoplight: id: b93chwval2t8d type: object required: - model - field - message properties: model: type: string x-stoplight: id: 30myfyjkno8ao description: The Model associated with this Error field: type: string x-stoplight: id: 8gl4ed3uxhdws description: The field associated with this Error message: type: string x-stoplight: id: bmgbrtmw17qsj description: The Error message additionalProperties: false responses: Error: description: Error response content: application/json: schema: $ref: '#/components/schemas/Error-Response' type: object UnauthenticatedError: description: Example response content: application/json: schema: $ref: '#/components/schemas/UnauthenticatedError-Response' type: object ModelError: description: '' content: application/json: schema: $ref: '#/components/schemas/ModelError-Response' type: object securitySchemes: bearerAuth: type: http scheme: bearer bearerFormat: JWT ````