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curl -v -u <AUTH_ID>:<AUTH_TOKEN> https://url/ \
    -H 'content-type: application/json' \
...
    "source": "from", \
    "text": "Sent from curl"}'

$to = "John";
$from = "John";
...
$reponr = ( decode_json $response->{'content'} );
print "$reponr\n";