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Compact e-commerce flow with box groupings

Comprehensive e-commerce checkout sequence with inventory and payment

Complete e-commerce checkout flow with colored background sections for each phase

E-commerce checkout sequence with payment processing and inventory

Synchronous checkout request sequence across gateway and services. Starter template grounded in the Basic Sequence D2 syntax pattern.

Synchronous checkout request sequence across gateway and services. Operations variant that adds fraud scoring interactions before final response assembly.

Synchronous checkout request sequence across gateway and services. Enterprise variant that adds status polling and finalization lookups for client confirmation.