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Documentation Index

Fetch the complete documentation index at: https://clapvo.com/docs/llms.txt

Use this file to discover all available pages before exploring further.

Delivery checks
Most delivery issues fall into a handful of categories. Walk through them in order.

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Common causes

  • The recipient phone number is invalid or missing the country code
  • The recipient does not have WhatsApp on that number
  • The recipient has blocked your number
  • Your number was rate-limited or temporarily restricted by WhatsApp
  • The connection sending the message went offline mid-send

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Steps to diagnose

1

Check the phone number format

It must include the country code (for example, +1, +91, +55).
2

Check the connection status

Open Connections. Make sure the sending number is connected.
3

Try sending again

Open the chat or campaign and retry the send.
4

Test with a known-good number

Send to a colleague to confirm the connection itself works.
5

If many recipients failed

Your number may be rate-limited. Slow down sends, enable randomize sender, or pause to let limits reset.

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Tips

  • If undelivered messages are a recurring problem on one number, that number may have a poor sender reputation. Add more connections and rotate.
  • For campaigns, use randomize sender and randomize message together to protect deliverability.