$params['total_amount']['api.required'] = 1;
$params['payment_instrument_id']['api.aliases'] = array('payment_instrument');
$params['receive_date']['api.default'] = 'now';
+ $params['receive_date']['api.required'] = TRUE;
$params['payment_processor'] = array(
'name' => 'payment_processor',
'title' => 'Payment Processor ID',