LINE Bot Uses Gemini AI to Merge Dual-Sided Business Card Data into One Record

A developer team behind a LINE-based business card scanning bot identified a recurring problem where bilingual Taiwanese business cards — Chinese on one side, English on the other — were being saved as two separate records. To fix this, the bot was updated to ask users after scanning the front side whether a back side exists, then waits up to five minutes for the second image. Instead of writing manual string-merging rules, the team chose to pass both card images simultaneously to Google's Gemini model in a single API request for semantic-level data integration. The merged output follows the same structured JSON schema used for single-card scans, ensuring consistency in the database. This approach eliminates duplicate records and removes the burden of manual cleanup from users.
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