I'm getting INVALID_RECIPIENT using the POST /core/messages API. Whats wrong with my request?
REQUEST DATA
{
"key": "****************",
"from": "12",
"to": "1,11",
"title": "Sample title",
"body": "Sample content..."
}
RESPONSE
{
"errorCode": "1C374\/3",
"errorMessage": "INVALID_RECIPIENT"
}