In this analytical research, the dependency of trust on the user interface in e-commerce has been reviewed. The approach of this case study on payment gateways (PGs) was a combination of the cross-sectional analysis and empirical study. First, the situation of a PG was evaluated in the marketing campaign. Then, the UI of 8 famous PGs was redesigned and 160 volunteers ranked the credibility of each page. Finally, the highest-ranked page was implemented, and the campaign was repeated. Results showed the users who trusted increased from 23.4% to 54.5% due to a new UI design.
