The invention provides a method and system for performing secure real-time processing of an invoice pertaining to a transaction between a merchant and a client. Upon receiving the invoice, the method and system determines if the invoice includes a merchant's tax registration number and a client's tax registration number. The method and system verifies the invoice by validating the merchant's tax registration number and the client's tax registration number by performing a lookup in a tax registration number database. Additionally, the method and system evaluates and verifies if one or more product/service categories corresponding to line items included in the invoice are in compliance with product/service category policies defined by the client and a line amount is within a spend limit, by checking a rules/policy database. Thereafter, the method and system approves a transaction amount for the transaction in response to verifying the invoice and processes the transaction amount.
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