SOAP API

In plain words: REST is like sending a postcard (lightweight, JSON-formatted, quick to read), while SOAP is like sending a registered, tamper-evident envelope with a legal contract inside (strictly typed, XML-only, highly regulated). Salesforce supports both to let you connect any external system. Salesforce integrations rely on communication protocols that determine how external applications talk to your CRM data. While modern architectures favor lightweight, mobile-ready interfaces, legacy enterprise architectures demand strict contracts and strict data governance. The two primary protocols fulfilling these needs are REST (Representational State Transfer) and SOAP (Simple Object Access Protocol) .

In plain words: Salesforce SOAP Integration allows enterprise systems to exchange structured data with Salesforce using XML-based messages governed by a strict contract called a WSDL (Web Services Description Language). While REST is great for lightweight, flexible web apps, SOAP provides strict typing, formal contracts, and enterprise-grade reliability for banking, ERP, and legacy systems. Connecting Salesforce with on-premises infrastructure, financial hubs, and enterprise resource planning (ERP) platforms often requires a contract-first integration approach. SOAP (Simple Object Access Protocol) provides a rigid, XML-based messaging framework that guarantees data structure conformity, strict data typing, and reliable end-to-end communication across enterprise systems.

In plain words: A Salesforce Session ID (or OAuth access token) acts as a digital key that proves your identity to Salesforce. Once authenticated, external applications pass this token in the Authorization: Bearer <Session_ID> header to query database records, execute REST/SOAP APIs, or trigger automations without re-entering login credentials on every request. Connecting third-party platforms, microservices, or custom scripts to Salesforce requires a valid authentication token. Whether you are building an integration using legacy SOAP web services or modern REST APIs, obtaining a session ID is the first step. Below is a breakdown of how to retrieve session IDs using SOAP login requests, native Apex methods, and modern OAuth 2.0 standards.

In plain words: SOAP API integration in Salesforce Apex enables your org to exchange structured, XML-based messages with external enterprise systems. By importing a WSDL document into Salesforce using the built-in WSDL2Apex wizard, the platform auto-generates strongly typed Apex classes that use WebServiceCallout.invoke to send requests and parse responses with minimal manual parsing. While lightweight REST integrations with JSON payloads dominate modern web APIs, many mission-critical enterprise systems—including legacy ERPs, banking networks, and government data exchanges—rely strictly on the SOAP (Simple Object Access Protocol) standard. Salesforce Apex provides native support for both consuming external SOAP services via WSDL2Apex callouts and exposing custom Apex methods as SOAP web services.