src/Payum/Be2Bill/Api.php
public function payment(array $params)
    {
        $params['OPERATIONTYPE'] = static::OPERATION_PAYMENT;

        $this->addGlobalParams($params);

        return $this->doRequest([
            'method' => 'payment',
            'params' => $params
        ]);
    }
public function payment(array $params)
    {
        $params['OPERATIONTYPE'] = static::OPERATION_PAYMENT;

        $this->addGlobalParams($params);

        return $this->doRequest([
            'method' => 'payment',
            'params' => $params
        ]);
    }
@param array $params

@return array