How to Build a Tiered WhatsApp Commission Engine in Google Sheets for Free

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Small businesses handling high volumes of WhatsApp sales conversations often struggle with missed messages, unclear rep assignments, and error-prone manual commission calculations. A developer guide published on DEV Community proposes replacing costly WhatsApp SaaS platforms, priced between $49 and $499 per month, with a free Google Sheets and Apps Script setup. The core solution involves a Commission Rules tab that stores time-bound, per-rep tier rates, ensuring historical sales always calculate at the rate active on the day of the transaction. A custom script function splits individual sales across multiple revenue tiers rather than applying a single flat rate, fixing a common formula error. The system also handles refunds by reversing only the commission originally earned, preserving a clean audit trail without breaking past records.

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