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This study aims to examine the role of customer satisfaction and trust as determinants of loyalty in Grab online transportation services in Medan City. The research method used is a qualitative approach with a survey method. Data collection was carried out through the distribution of online questionnaires to 60 respondents selected using purposive sampling technique. The data were analyzed descriptively using a Likert scale. The results showed that customer satisfaction, which includes service quality, driving experience, driver professionalism, vehicle cleanliness, and complaint handling, was rated quite well by the respondents. Customer trust in Grab as a safe, transparent, and reliable transportation choice has also proven to be an important factor in building loyalty. However, customer loyalty to Grab is not very strong, given the intense competition in the online transportation industry. The implication is that Grab and similar companies need to continue improving service quality, ensuring customer safety and comfort, responding to complaints effectively, and implementing effective marketing strategies to retain customers. This research provides valuable insights for online transportation service providers in their efforts to enhance customer satisfaction, trust, and loyalty amidst dynamic market competition.

The rapid development of e-commerce in Indonesia has prompted attention to factors that can maintain business sustainability, especially in terms of customer loyalty. The literature study identified several determining factors, including service quality, customer satisfaction, and brand trust. This research was conducted with the aim of examining the impact of service quality, customer satisfaction, and customer trust on customer loyalty in the Shopee mobile application in Jabodetabek. Using a purposive sampling method, the survey was carried out by distributing questionnaires directly to 120 customers. The results of regression analysis using SPSS refer to a statistical research process where data about the relationship between one or more independent variables (predictors) and one dependent variable (result) is analyzed. SPSS is used as a tool to analyze data and produce regression results. Thus, this research provides important implications that e- commerce mobile applications need to ensure service quality, satisfaction and customer trust to maintain and increase customer loyalty, as well as compete effectively in the online market.