Changes to Retrieve a customer invoice

added the new VES enum value to the currency response property for the response status 200

added the new es_ES enum value to the language response property for the response status 200

added the new optional header request parameter X-Company-Id

added the required property contract_reference to the response with the 200 status

added the required property e_invoicing/lifecycle_events to the response with the 200 status

added the required property installments to the response with the 200 status

added the required property payment_method_ledger_account to the response with the 200 status

added the required property performance_date to the response with the 200 status

added the required property purchase_order_reference to the response with the 200 status

added the required property sale_type to the response with the 200 status

added the required property sales_order_reference to the response with the 200 status