Which feature allows Lambda functions to interact with Salesforce records?

The ability for Lambda functions to interact with Salesforce records is facilitated through the REST API OAuth. This feature is crucial because it allows applications, such as AWS Lambda functions, to securely access Salesforce data by obtaining the necessary authorization. OAuth acts as a protocol that permits third-party applications to access user data without exposing their credentials, enabling the Lambda functions to authenticate against the Salesforce platform seamlessly.

Using REST API OAuth, Lambda functions can send requests to perform various operations, such as retrieving, creating, updating, or deleting Salesforce records. This interaction is essential for integrating different systems and automating workflows that require real-time data exchange between AWS services and Salesforce.

In contrast, while the other options may play important roles in different contexts, they do not specifically enable the interaction between Lambda functions and Salesforce records in the same way. Contact flow automation refers to managing customer interactions, Single Sign-On (SSO) primarily deals with user authentication across multiple applications, and custom permission sets are focused on user access controls rather than facilitating API interactions.