This case study outlines the development and utilization of a Mobile Augmented Reality (MAR) application to teach an asynchronous online lesson on e-commerce. The MAR technology was leveraged primarily to enhance the presentation of online learning materials, add interactivity to the learning process, and enable students to access the lesson from anywhere via their ubiquitous mobile devices. Two groups, comprising a total of 105 business students, participated in the online lesson during the COVID pandemic. Students' experiences of the implementation were captured through an online survey to find out how the MAR technology was perceived, and what were the benefits and challenges of using the technology. This study contributes to the research on the use of augmented reality in education and offers practical recommendations for teachers to consider when designing and implementing MAR online lessons, including the importance of learner-centered design, careful guidance on technology use, and encouragement of student interaction. The study concludes that augmented reality is a useful tool for improving learning materials and asynchronous online learning practices and MAR applications can be effective for learning with compact materials and micro-credentials.