Well-established industry for music store and repair services.brand Keylan switched to DerinSİS for e-commerce, store and preliminary accounting system.Keylan, which is the distributor of various brands in Turkey, continues its business in a multi-channel manner with its dealer network and internet retailing, apart from its store and repair workshop in Beşiktaş.It has many modules such as price, stock, labeling, handheld terminal, conversion and sales system.Keylan, who uses it in an integrated way, also interacts intensively with musicians through his Instagram account.With the Instagram integration of the site's products, it lists products in store format and can direct its followers to its site for shopping.