Authorities are investigating numerous complaints of credit card fraud in Allston, a Boston police spokeswoman said Saturday. Officer Neva Coakley said Boston police detectives, the Secret Service, and several major banks are looking into reports by residents of the neighborhood that their credit card information was stolen and used to make fraudulent purchases. Complaints by residents in the online forum reddit.com centered around Blanchard’s Liquors, a large shop on Harvard Avenue popular with students. Blanchard’s manager John Corey acknowledged that the store had received complaints, and that the store is cooperating with investigators. “There might have been a problem with one of the credit card processors,” he said, adding that as of Saturday, “the problem has been resolved.”Dan Adams can be reached at firstname.lastname@example.org. Find him on Twitter at @DanielAdams86.