Genesys Cloud's legacy GPE Tracking Snippet requires configuration of allowed website domains to manage and validate incoming web traffic sources. The system accepts only domain and sub-domain labels while excluding path specifications in configurations. Administrators must identify specific website domains from which to accept web traffic and ensure that the allowed domains list matches between the widget settings and Genesys Predictive Engagement configuration. For Messenger-specific domain restrictions, separate configuration is required through the Deploy Messenger feature's domain access restriction settings. This domain management functionality enables organizations to control web traffic sources accessing the platform while maintaining consistency across tracking and messaging components.