SOAP API now supports JWT-based access tokens from Salesforce OAuth flows. This feature provides parity with REST API authentication mechanisms and enables secure token sharing with external services.
Where: This change applies to Lightning Experience and Salesforce Classic in all editions.
How: Configure your connected app or external client app to issue JWT-based access
tokens instead of opaque access tokens. Include the JWT-based access token in the
sessionId element of the SOAP API request header.