Has anyone found documentation on actually performing the Merchant Validation step? A signed request to the validationURL in the onvalidatemerchant event gives me an error message requesting a valid JSON object. Passing a valid JSON object responds with
{
"statusMessage": "Payment Services Exception Invalid session request -- missing merchant identifier",
"statusCode": "400"
}
Unfortunately, all of the obvious key names for merchant identifier are failing me(id, merchant, merchant_id, merchant_identifier). As far as I can tell there, isn't any documentation surrounding this step.