The aim of this study was to investigate the effect of platform architecture flexibility on competitive performance, with mediation of purchasing power, channel management and online services and modulation of supplier, distributor and customer interaction (Case study: Digi Kala Company). This research is applied in terms of purpose and descriptive-survey in terms of nature. Research data were collected through Likert five-choice questions in the research questionnaire. In the present study, in order to analyze the data obtained from the questionnaire, SPSS statistical software and structural equation software pls in the form of two parts of descriptive and inferential statistics as linear and multiple regression have been used in accordance with the statistical needs. The statistical population of this research consists of the staff of the online company Digi Kala, numbering 800 people. The sampling method used in this study is simple random. Based on Cochran's formula at 95% confidence level, 261 people have been selected as a statistical sample. The results showed that the flexibility of platform architecture through the mediating role of online shopping ability have a significant effect on competitive performance (0.169). The flexibility of the platform architecture through the mediating role of online channel management capability has a significant effect on competitive performance (0.083). The flexibility of the platform architecture through the mediating role of service capability has a significant effect on competitive performance (0.289). Supplier interaction moderates the effect of platform architecture flexibility on online shopping capability (0.352). Distributor interaction moderates the effect of platform architecture flexibility on online channel management capability (0.307). Customer interaction moderates the effect of platform architecture flexibility on online service capability (0.109).