Before it was acquired by Facebook, WhatsApp used to display a banner in its app asking users to pay a nominal fee to use its messaging service after the first year. I’ve never paid that fee, and I don’t know anyone who has. But after nine years in existence, the company’s finally settled on a way to earn some cash. WhatsApp is expanding its Business API that let companies communicate with their customers on the platform. They can now programmatically send users information like shipping confirmations and boarding passes, offer real-time customer support, and accept inquiries via a click-to-chat button on…

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