The invoke activity includes the lCreditCardInput local input variable. The credit card authorization web service uses the lCreditCardInput input variable. This variable contains the customer's credit card type, credit card number, and purchase amount. The lCreditCardOutput variable returns status results from the CreditCardAuthorizationService service. The following example provides details.

<invoke name="InvokeCheckCreditCard"
    inputVariable="lCreditCardInput"
    outputVariable="lCreditCardOutput"
    partnerLink="CreditCardAuthorizationService"
    portType="ns2:CreditAuthorizationPort"
    operation="AuthorizeCredit"/>