WhatsApp error 132012: template parameter format mismatch

What has to line up

All of it, and silently. There is no partial match.

• Count: three placeholders in the body means three body parameters, no more and no fewer.
• Order: parameters are positional, so swapping two produces a sent message with the values in the wrong places, or this error if the types differ.
• Type: a currency or date parameter has a defined object shape and cannot be sent as plain text.
• Components: header, body and button parameters are separate lists and cannot be merged into one.

The edit that breaks production

Templates are edited by people who are not the people calling the API. Someone adds a variable to make a message clearer, the template is re-approved, and every send from the unchanged integration starts failing.\n\nThis is worth defending against rather than discovering. Subscribing to template status webhooks means an edit arrives as an event, and treating a template's variable count as part of the integration contract, reviewed when it changes, prevents a wording improvement from becoming an outage.

Common mistakes

• Sending an extra parameter defensively. More is as wrong as fewer.
• Treating positional parameters as named. They are matched by position only.
• Editing a template without checking the code that sends it.

Frequently asked questions

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