Addressing empirical fragmentation in omnichannel literature, this study models how individual psychological attributes and structural service flows drive collaborative customer behaviors within emerging e-commerce markets. It evaluates the effects of Personality Traits and Customer Journey Design on Value Co-Creation Behavior, mediated by Omnichannel Trust and Omnichannel Customer Experience, alongside the moderating influences of Digital Proficiency and Channel Preference. Structural Equation Modeling (SEM-PLS via SmartPLS 4) was executed on survey responses gathered from 300 active Indonesian omnichannel shoppers through purposive sampling. Findings demonstrate that seamless journey designs and adaptive personality traits significantly elevate both customer trust and experiential quality, which directly propel value co-creation participation. Conversely, neither digital proficiency nor channel preferences exhibit significant moderating effects. The proposed model demonstrates moderate explanatory power, capturing variance across key outcomes with $R^2$ values of 0.533 for Customer Experience, 0.501 for Trust, and 0.359 for Value Co-Creation Behavior. Theoretically, this research extends Service-Dominant Logic and Trust Theory by establishing a dual-mediation mechanism that bridges micro-level individual traits and macro-level service architectures. The study's primary novelty rests on synthesizing behavioral readiness and touchpoint design into a unified framework. Practically, e-commerce executives must emphasize friction-free cross-channel integration and transparent system reliability over tailored channel isolation or reliance on user digital capabilities
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