Shopping on Instagram just got a lot easier. The app has added a new checkout feature. Users can now buy from their favorite store directly through the app. H&M, ColourPop Cosmetics, Nike and other brands are already using the feature to cash in on customers. Merchants will have to pay a fee to sell their items through the app, which make it another benefit for Instagram’s business offerings. Users can store their PayPal, Mastercard and Visa payment information within the app. The newest feature comes almost a week after Facebook, Instagram and Whatsapp crashed following a “ server configuration change.” Some users who run their businesses solely through Instagram ran to Twitter to complain about how the crash negatively impacted their engagement and sales numbers for the day. “Once your first order is complete, your information will be securely saved for convenience the next time you shop,” Instagram said on its blog. “You’ll also receive notifications about shipment and delivery...