Sample SOAP UI request for PaymentRegistry service.
Will return response like:
<S:Envelope xmlns:S="http://schemas.xmlsoap.org/soap/envelope/">
   <S:Body>
      <ns2:checkPaymentAmountResponse xmlns:ns2="http://registry.ws.osb.epam.com/">
         <result>437813611408871363</result>
      </ns2:checkPaymentAmountResponse>
   </S:Body>
</S:Envelope>
Change paymentAmount value to negative or zero amount to return result -1