What does a Remote Call-In do?

A Remote Call-In is primarily designed to allow remote systems to interact with Salesforce by updating its data. This means that systems or applications outside of Salesforce can make API calls that directly modify records, which is essential for maintaining up-to-date information across integrated platforms.

In scenarios where external applications need to reflect changes made in Salesforce, Remote Call-In provides a mechanism for those updates to occur seamlessly. This feature is particularly valuable when integrating third-party applications that require the ability to submit data to Salesforce or modify existing records based on external events, such as changes in a web application or data processed in an enterprise resource planning (ERP) system.

Considering the other options, while transferring data from Salesforce to a remote system or enabling continuous data synchronization with external databases are relevant functions, they don't accurately define the primary purpose of a Remote Call-In. The task of recording billing transactions is also not specifically tied to the Remote Call-In functionality, as it relates more to transaction processing within Salesforce. Therefore, the focus on updating Salesforce data from remote systems is what makes this answer the most accurate.