How to Build a Multilingual Voice AI Sales Agent Using Vapi and Shopify

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A step-by-step developer guide published on DEV Community outlines how to build a multilingual voice AI sales agent for ecommerce using Vapi, Shopify, OpenAI, and Google Cloud Text-to-Speech. The system allows customers to place orders, ask product questions, and receive upsell recommendations entirely over the phone in multiple languages. The workflow uses n8n as an orchestration layer to connect Vapi's speech handling, OpenAI's GPT-4 for conversational reasoning, Shopify's GraphQL API for product and order management, and Google Cloud for high-quality speech synthesis. Vapi supports over 30 languages through a single endpoint, eliminating the need for separate language-specific pipelines. The estimated build time is 8 to 12 hours depending on the developer's familiarity with the platforms involved.

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