https://uppu.net/en/blog/feed.xml Guides to WhatsApp, privacy and customer messaging 2026-10-22T00:00:00Z UPPU https://uppu.net/ © UPPU · Alone AI Teknoloji Ltd. Şti. https://uppu.net/en/blog/whatsapp-pricing-october-2026 2026-10-22T00:00:00Z 2026-10-22T00:00:00Z

Service messages are charged again, with 1,000 free per business number each month. Utility templates, the ad window, the public-sector policy and payments.

https://uppu.net/en/blog/whatsapp-business-app-vs-api 2026-10-22T00:00:00Z 2026-10-22T00:00:00Z

When the free app is enough, and why growing teams move to the API: rules, costs, what happens to your number, the migration steps and a decision table.

https://uppu.net/en/blog/verify-webhook-signatures-php-node-python 2026-10-22T00:00:00Z 2026-10-22T00:00:00Z

A step-by-step guide to HMAC-SHA256 webhook verification: signed content, raw-body pitfalls, constant-time checks, timestamps, rotation and a test vector.

https://uppu.net/en/blog/official-whatsapp-api-vs-unofficial-tools 2026-10-22T00:00:00Z 2026-10-22T00:00:00Z

QR-linked tools conflict with WhatsApp's terms and put your number at risk. The official platform's rules, its real cost and a step-by-step migration plan.

https://uppu.net/en/blog/whatsapp-24-hour-window-templates 2026-10-22T00:00:00Z 2026-10-22T00:00:00Z

How WhatsApp's 24-hour window works, what the template categories mean, how to write variables, and why templates get rejected, step by step.

https://uppu.net/en/blog/idempotent-message-sending-retries 2026-10-22T00:00:00Z 2026-10-22T00:00:00Z

Why messaging APIs send duplicates, how Idempotency-Key works, which errors to retry and how, and how to order delivery statuses that arrive out of order.