Mexgrocer.com primarily operates online and is focused on providing a convenient shopping experience through its website. Typically, online orders are paid for at the time of checkout using various payment options available on the site. Unfortunately, paying directly in-store for an online order is not a standard option with Mexgrocer.com. The company emphasizes an online shopping model, which includes payment processing through secure methods on their platform. However, if there are any specific services, promotions, or changes regarding this policy, customers may want to check the current information on the Mexgrocer website. There, you will find the most up-to-date details on payment methods and possible in-store options if they are made available.