You are simply missing a comma after the handler.url
property, this is the correct markup:
<script type="application/ld+json">
{
"@context": "http://schema.org",
"@type": "EmailMessage",
"description": "Retry fax sending",
"action": {
"@type": "ConfirmAction",
"name": "Retry",
"handler": {
"@type": "HttpActionHandler",
"url": "http://example.com/do/ba98262b-6eb9-4314-a01a-8ff3076821e3",
"method": "POST"
}
}
}
</script>
You can use the Schema Validator tool to check your markup for syntax errors like this: https://developers.google.com/gmail/schemas/testing-your-schema
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