OmniScript is the correct tool because the requirement is a guided, step-by-step digital interaction. The citizen must move through several screens, answer questions, upload supporting documentation, and complete an application process. Calculation Matrices are for rules-based calculations, not user-facing permit forms.
Integration Procedures handle server-side orchestration and integrations, but they do not provide the guided UI experience. FlexCards are used to display contextual information and actions, not to run a multi-screen application journey. Salesforce specifically positions OmniScripts as guided processes for customers, partners, and internal users, and Salesforce Public Sector documentation describes OmniScripts as tools for dynamic application forms for licenses, permits, programs, and services. Salesforce also supports file upload elements within OmniScripts.