A digital marketing agency is defined as the resource which offers to provide a wide range of marketing services under one roof. These agencies are approached when a business lacks the availability of in-house expertise within them. The agency is targeted at managing a large number of clients but their foremost goal is to increase the sales of products and services through their countless efforts. The client is to make payment for services received from these agencies. This payment comes in the form of an invoice. It does so by having a breakdown of services and then calculating the total cost of services.