The business_messaging Trap: Fixing Telegram Bot Conversion Tracking on Meta's Platform

Developers integrating Telegram bots with Meta's Conversions API often hit a 400 error by incorrectly using the business_messaging action_source, which Meta reserves exclusively for its own messaging products. Understanding why business_messaging fails and switching to the 'other' source—combined with proper fbclid capture and custom_data configuration—is essential for accurate conversion attribution and ad performance measurement.