Photographer: Eva Marie Uzcategui/AFP/Getty Images After Maura Fonseca moved to Houston from Mexico in 2011, she often waited hours in line at Western Union to send money to her three children and her mother. The fees were so steep she sometimes had to borrow money to pay them. Most Read from Bloomberg These days, Fonseca sends money home using Felix Pago, a WhatsApp-based digital app. “It’s so much better because it’s cheaper, instantaneous and I don’t have to leave my house,” said the 60-year-old w ...