arazzo: 1.0.1
info:
  title: Abstract API VAT Validation to Rates and Calculation
  summary: Validate a VAT number, fetch its country rates, then calculate VAT on an amount.
  description: >-
    A tax-compliance flow that validates a VAT number with the VAT Validation
    API and branches: when the number is invalid it ends with the verdict, and
    when it is valid it uses the resolved country code to look up the country's
    VAT rates and then calculate the VAT due on a supplied amount. Every step
    inlines the api_key query parameter and request so the flow reads and runs
    without opening the underlying OpenAPI descriptions.
  version: 1.0.0
sourceDescriptions:
- name: vatValidationApi
  url: ../openapi/abstract-api-vat-validation.yaml
  type: openapi
workflows:
- workflowId: vat-validation-to-rates-and-calculation
  summary: Validate a VAT number then resolve rates and calculate VAT for its country.
  description: >-
    Validates a VAT number and, for a valid number, branches to retrieve the
    country's VAT rates and calculate the VAT due on the supplied amount using
    the resolved country code.
  inputs:
    type: object
    required:
    - apiKey
    - vatNumber
    - amount
    properties:
      apiKey:
        type: string
        description: Abstract API key valid for the VAT Validation API.
      vatNumber:
        type: string
        description: The VAT number to validate (e.g. GB123456789).
      amount:
        type: number
        description: The monetary amount to calculate VAT on.
      isVatIncl:
        type: boolean
        description: Whether the supplied amount already includes VAT.
  steps:
  - stepId: validateVat
    description: >-
      Validate the VAT number and retrieve the associated company and country
      details.
    operationId: validateVATNumber
    parameters:
    - name: api_key
      in: query
      value: $inputs.apiKey
    - name: vat_number
      in: query
      value: $inputs.vatNumber
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      isValid: $response.body#/is_valid
      countryCode: $response.body#/country/code
      companyName: $response.body#/company/name
    onSuccess:
    - name: vatValid
      type: goto
      stepId: getRates
      criteria:
      - context: $response.body
        condition: $.is_valid == true
        type: jsonpath
    - name: vatInvalid
      type: end
      criteria:
      - context: $response.body
        condition: $.is_valid == false
        type: jsonpath
  - stepId: getRates
    description: >-
      Retrieve the VAT rates for the country resolved from the validated VAT
      number.
    operationId: getVATRates
    parameters:
    - name: api_key
      in: query
      value: $inputs.apiKey
    - name: country_code
      in: query
      value: $steps.validateVat.outputs.countryCode
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      countryName: $response.body#/country_name
  - stepId: calculateVat
    description: >-
      Calculate the VAT due on the supplied amount for the resolved country.
    operationId: calculateVAT
    parameters:
    - name: api_key
      in: query
      value: $inputs.apiKey
    - name: amount
      in: query
      value: $inputs.amount
    - name: country_code
      in: query
      value: $steps.validateVat.outputs.countryCode
    - name: is_vat_incl
      in: query
      value: $inputs.isVatIncl
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      vatCountryName: $response.body#/country_name
  outputs:
    isValid: $steps.validateVat.outputs.isValid
    countryCode: $steps.validateVat.outputs.countryCode
    countryName: $steps.getRates.outputs.countryName