API ReferenceInvoiceCancelOn this pageCancel Cancels an invoice. POST Invoice/Cancel Input ParameterTypeRequiredDescriptionDefaultMerchantIdstringnoyour merchant ID–InvoiceIdstringnoinvoice ID– Output None. Example Input { "MerchantId": "8XOZ64KC9X", "InvoiceId": "shE2LfDbUYlsgz"}