We all like to be treated with priority, right? When you are boarding a flight, visit a tourist place or queueing to enter a cinema, separate lanes for priority passengers or visitors are quite common. Visa application and approval is a business process where prioritizing applications is norm. Vendor organizations handling visa applications prioritize based on the role of applicant (for e.g., State heads and employees in embassies get highest priority), the premium paid (if you are willing to pay premium fees, your visa is processed faster) & other special conditions. It is an important technical requirement that systems that process applications connect through the ESB layer.