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I measured M-Pesa STK Push polling lag on a real device. The variance will ruin your UX.
2+ week, 1+ day ago (683+ words) Same code. Same device. Same network. Same shortcode. Test 1: 39 seconds from PIN entry to UI update. Test 2: 3 seconds. 13x variance. Not a bug. Not a fluke. Just the math of a fixed polling schedule colliding with a non-deterministic callback. When you…...
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