SOAP
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SOAP is an older XML-based protocol used in many enterprise systems.
It’s less common for new web apps, but still appears in long-lived integrations.
Where SOAP Is Used
Section titled “Where SOAP Is Used”- Legacy enterprise integrations (especially older vendor systems)
- Regulated industries with long-running contracts (finance, government)
Industry Examples (Companies)
Section titled “Industry Examples (Companies)”- PayPal: historically offered SOAP APIs (alongside other options)
- Salesforce: supports SOAP APIs for certain integrations
Note: company tech choices change over time; these are common, well-known examples.
Tiny Example (Envelope)
Section titled “Tiny Example (Envelope)”<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"> <soap:Body> <GetUser> <Id>42</Id> </GetUser> </soap:Body></soap:Envelope>