Slack is a feature enriched team messaging app that offers a rich set of tools and options. It helps in sending instant messages to users or channels and can generate invoices and can automatically process payments in quickbooks slack integration . It is a real-time B2B messaging platform app that offers an amusing interface that brings colors to the messaging platform. This messaging platform is the most expensive in its league as it offers several types of IT solutions that ease the flow of messaging in the organization. Slack is a highly customizable app and integrates with many useful office management tools and apps.