🚀 SAP CPI REST to SOAP Integration | Convert JSON to XML and Call a SOAP Web Service
Want to learn how to call a SOAP web service from an HTTP-triggered integration flow in SAP CPI (SAP Cloud Integration)?
In this practical SAP Integration Suite tutorial, we build an end-to-end integration scenario for a sample business called ABC Manufacturing. A client sends a number in JSON format through Postman, SAP CPI validates the input, constructs a SOAP XML request, calls a public Number-to-Words SOAP service, and returns the result to the original HTTP caller.
This hands-on scenario demonstrates how SAP Cloud Integration can bridge a REST-style JSON request and a SOAP/XML backend.
🔥 What You Will Learn
✅ 1. Build an SAP CPI HTTP Integration Flow
Configure an HTTP Sender endpoint.
Receive a POST request from Postman.
Use /number-to-words as the proposed endpoint path.
✅ 2. Test the Integration Using Postman
Send a JSON request with the required number field.
Set the Content-Type to application/json.
Test valid and invalid input examples.
Sample request:
{“number”: 125}
✅ 3. Validate JSON Input Using Groovy
Parse the incoming JSON payload.
Check whether the required field is present.
Validate that the number is a non-negative integer.
Handle missing fields, invalid values, and malformed JSON.
✅ 4. Configure Content Modifier
Set the SourceSystem property to Postman.
Add useful tracking or correlation properties.
Understand how exchange properties support integration flow processing.
✅ 5. Convert JSON to SOAP XML
Understand the SOAP Envelope and Body.
Construct the XML request for the NumberToWords operation.
Learn the purpose of XML namespaces and the ubiNum input element.
✅ 6. Call a SOAP Web Service Using Request Reply
Configure a synchronous Request Reply call.
Understand SOAP receiver configuration.
Learn why the WSDL matters when configuring SOAP version, binding, and SOAPAction where applicable.
Demo SOAP endpoint:
https://www.dataaccess.com/webservicesserver/NumberConversion.wso
✅ 7. Process the SOAP Response
Inspect the response from the Number-to-Words service.
Extract or normalize the returned result where required.
Return a useful response to Postman.
✅ 8. Implement Error Handling
Handle invalid JSON and invalid number values.
Understand SOAP and HTTP failure scenarios.
Return controlled errors to the calling client.
🔄 End-to-End Integration Flow
Postman → HTTP Sender → Content Modifier → Groovy Validation → SOAP XML Request → Request Reply → SOAP Receiver → Response Handling → Postman
🛠️ SAP CPI Concepts Covered
• SAP Cloud Integration and SAP Integration Suite
• REST API and SOAP Web Service integration
• JSON parsing and XML construction
• HTTP Sender Adapter
• SOAP Receiver configuration
• Request Reply
• Content Modifier and exchange properties
• Groovy scripting
• WSDL, SOAP Envelope, XML namespaces, and SOAPAction
• Input validation and exception handling
• Postman testing and troubleshooting
🎯 Who Should Watch?
This tutorial is useful for:
SAP CPI beginners learning integration flows
SAP Cloud Integration developers
SAP Integration Suite consultants
SAP BTP integration learners
Developers learning REST-to-SOAP communication
SAP CPI certification and interview preparation candidates
💡 Why Is This Scenario Important?
Many integration projects need to connect modern REST-style applications with existing SOAP services. Understanding payload transformation, request validation, SOAP configuration, and response handling helps you build reliable integrations between systems that use different communication formats.
This Number-to-Words example provides a simple way to practise those concepts in one end-to-end SAP CPI scenario.
Note: This is a learning demonstration using a public third-party SOAP service. Verify the current WSDL and service availability during implementation, and follow the service contract for SOAP version, namespace, content type, and SOAPAction requirements.
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