Calling a REST webservice with pl/sql and parse XML

Hi
I hope someone is able to help me with this task. I'm newbie with Oracle APEX, have not developed advanced applications yet. A few days ago I installed one of the package application with customer and order. I want to integrate with online shopping with Rest service using PL / SQL. NETS is a provider of online payment systems.
http://www.betalingsterminal.no/Netthandel-forside/Teknisk-veiledning/Communication/REST/
There are four steps you must go through to execute the payment. where it is retunert xml files containing infomation to be used further.
Step 1 - Register payment
Webshop Performs Register:
https://epayment-test.bbs.no/Netaxept/Register.aspx?MerchantId=9999997&token=secret&orderNumber=10011&amount=200&CurrencyCode=NOK
&redirectUrl=http://webshop/RegisterReply.asp
Reply from payment provider:
<? Xml version = "1.0"?>
<RegisterResponse Xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<TransactionId> B127f98b77f741fca6bb49981ee6e846 </ TransactionId>
</ Register Response>
Step 2 - Present Web form to customer
Webshop's customer submit web form:
https://epayment-test.bbs.no/Terminal/default.aspx?merchantId=9999997&transactionId=b127f98b77f741fca6bb49981ee6e846
Step 3 - "Redirect" customer back to merchant
Payment provider send URL to redirect webshop's customer:
http://webshop/RegisterReply.asp?transactionId=b127f98b77f741fca6bb49981ee6e846&responseCode=OK
Step 4 - Process payment
Webshop Performs Process (AUTH):
https://epayment-test.bbs.no/Netaxept/Process.aspx?merchantId=9999997&token=&transactionId=b127f98b77f741fca6bb49981ee6e846&operation=AUTH
Reply from payment provider:
<? Xml version = "1.0"?>
<Process Response xmlns: XSi = "http://www.w3.org/2001/XMLSchema-instance" xmlns: xsd = "http://www.w3.org/2001/XMLSchema">
<Operation> AUTH </ Operation>
<ResponseCode> OK </ Response Code>
<AuthorizationId> 064392 </ AuthorizationId>
<TransactionId> B127f98b77f741fca6bb49981ee6e846 </ TransactionId>
<ExecutionTime> 2009-12-16T11: 17:54.633125 +01:00 </ ExecutionTime>
<MerchantId> 9999997 </ MerchantId>
</ Process Response>
Webshop Performs Process (CAPTURE)
https://epayment-test.bbs.no/Netaxept/Process.aspx?merchantId=9999997&token=&transactionId=b127f98b77f741fca6bb49981ee6e846
&transactionAmount=200&operation=CAPTURE
Reply from payment provider:
<? Xml version = "1.0"?>
<ProcessResponse Xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<Operation> CAPTURE </ Operation>
<ResponseCode> OK </ Response Code>
<TransactionId> B127f98b77f741fca6bb49981ee6e846 </ TransactionId>
<ExecutionTime> 2009-12-16T11: 40:57.601875 +01:00 </ ExecutionTime>
<MerchantId> 9999997 </ MerchantId>
</ Process Response>
I really appreciate if anyone can help me with This

Hi,
Is there any particular reason you want to call a form through provider API?
Because when you call a from through
wwa_api_provider.show_portlet the issue #1 is true (you cannot pass parameteres to a form) and the issue #2 could be resoled by supplying a porltet_record.p_page_url to the current page URL.
However, there is a form-specific PLSQL APIs to call a form and pass parameters to that from which is describe in our FAQ list:
http://otn.oracle.com/products/iportal/htdocs/portal_faq.htm#BuildingApplications
Please see following topics:
"How do I call a form in insert mode and pass it default values?"
and
"How do I call a form and pass it a query condition to be automatically executed?"
Thanks,
Dmitry

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