WhatsApp error 135000: Generic user error

Code 135000 means the platform found something wrong with your request parameters but could not map it to a more specific error. It is the parameter-validation equivalent of 131000: the request was understood well enough to know it is bad, but not well enough to say why. Meta's guidance is to check the endpoint reference to confirm you are using the correct syntax and to contact support if it keeps happening.

Unlike 100, 131008, and 131009, there is usually no helpful path in error_data.details, which is what makes 135000 annoying. It tends to appear with unusual combinations: a field that is valid on its own but inconsistent with another, a deeply nested object in the wrong place, or values that individually pass checks but together describe an impossible message.

It is deterministic. Retrying the same payload will not help; the payload has to change.

Keep one verified fixture per message type under version control and generate production payloads from the same builders, so structural drift is caught by tests. When you adopt a new API version, run the full fixture suite against a test number before deploying. Log full payloads for 135000 responses to make isolation fast. Its better-labelled siblings are 100, 131008, and 131009; the payload-reduction technique in the error-code guide is the fastest way to isolate the field.