Changes to POST /companies/:companySlug/invoices/drafts

added the new optional request property endDate

added the new optional request property frequency

added the new optional request property roundingType

added the new optional request property startDate

the request optional property lines/items/invoiceishDraftLineId became read-only

added the new repeating_invoice enum value to the request property type

added the new optional request property lines/items/invoiceishDraftLineId

the endpoint scheme security fiken_api_oauth was removed from the API