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connection_test.webhook_missing

The platform's webhook is not registered with Revolut, or its URL or events differ (the WebhookRegistration check). Registering the webhook again from the Revolut connection page fixes it.

Codeconnection_test.webhook_missing
HTTP statusNone: a result code, recorded on a resource (for example an operation's resultCode) rather than returned as a problem response (— (result code))
ArgumentsNone (args is {})

Handling it

Branch on code, not on title or the status alone, and log traceId. Codes are stable; new codes may appear, so fall back on the HTTP status for a code you do not know. See Handling errors and the list of codes.