Changes to List billing invoices

the response property data/items/contract_id became nullable for the status 200

the response property data/items/document_state became nullable for the status 200

the response property data/items/period_end became nullable for the status 200

the response property data/items/period_start became nullable for the status 200

the response property data/items/contract_id became optional for the status 200

the response property data/items/document_state became optional for the status 200

the response property data/items/period_end became optional for the status 200

the response property data/items/period_start became optional for the status 200

the data/items/document_state response's property type changed from string to no type for status 200

api operation id listNativeInvoices removed and replaced with listBillingInvoices

added the new optional query request parameter past_due

added the new optional query request parameter provider_type

added the new optional query request parameter q

added the new optional query request parameter status

added the optional property data/items/external_id to the response with the 200 status

added the optional property data/items/subscription_external_id to the response with the 200 status

added the optional property data/items/url to the response with the 200 status

added the optional property params/past_due to the response with the 200 status

added the optional property params/provider_type to the response with the 200 status

added the optional property params/q to the response with the 200 status

added the optional property params/status to the response with the 200 status

added InvoiceDocumentState to the data/items/document_state response property allOf list for the response status 200

removed the credited enum value from the data/items/document_state response property for the response status 200

removed the draft enum value from the data/items/document_state response property for the response status 200

removed the finalized enum value from the data/items/document_state response property for the response status 200

removed the void enum value from the data/items/document_state response property for the response status 200

added the required property data/items/provider_type to the response with the 200 status

endpoint added