- As a premier credit card processing company, we have perfected the process. American Merchant Center Inc. LLC offers the reliability in processing that businesses deserve. br br American Merchant Center, Inc. br 6819 N. Sepulveda Blvd, Ste 311 br Van Nuys, Ca 91405 br Phone Number: 818-947-1700 br Toll free no.: 800-319-2274 br Fax Number: 818-947-1710 br Email Address: info@americanmerchant.