WhatsApp error 130403: Business has blocked the user

Code 130403 means the delivery failed because your own business has blocked this WhatsApp user. The Cloud API lets a business block users via the block users endpoint or from WhatsApp Manager, usually to stop abuse or spam. Once blocked, any attempt to send to that number fails with 130403 and the message is not delivered, regardless of whether it is a template or a free-form reply.

This is the mirror image of the situation people usually worry about. The user has not blocked you; you have blocked them. Because blocks are often applied by a support agent in WhatsApp Manager while an automated system continues to send, the error can look baffling from the engineering side.

Meta's guidance is explicit: do not retry. Retrying will not deliver the message and only consumes rate limit.

The failure is reported in the statuses webhook rather than the synchronous response, since the send was accepted before the block was checked; if you are not seeing these events, verify your webhook subscription with the webhook debugging guide. Contrast it with 131026, where the obstacle is on the recipient's side rather than yours.

Keep your block list synchronized with your messaging platform and check it before dispatch, so blocked users are excluded rather than attempted. Make blocking a deliberate action with an audit trail, and have any automated blocking routine emit an event that suppresses the contact everywhere else in your stack.