Dr. Miquel Velazquez doesn’t have a lot of bandwidth to manage the flow of money in and out of his medical practice. “I have a staff of one plus myself, so I can’t put a lot on her plate in terms of figuring out our business needs,” said Velazquez, a doctor in Westbrook, Maine, who provides muscular treatments out of a single office. “I have to handle whatever comes up that needs attention.” While Velazquez might seem like the prime target for a digital payments startup that promises a wide range of services through the web, he instead went with