<?xml version="1.0"?><methodCall><methodName>InvoiceService.validateCreditCard</methodName><params><param><value><string>key</string></value></param><param><value><struct><member><name>CardNumber</name><value><string>7357</string></value></member><member><name>ContactId</name><value><int>1</int></value></member><member><name>ExpirationMonth</name><value><string>13</string></value></member><member><name>ExpirationYear</name><value><string>1991</string></value></member><member><name>CVV2</name><value><string>123</string></value></member><member><name>CardType</name><value><string>MasterCard</string></value></member></struct></value></param></params></methodCall>