OSB - How to pass Authorization header from Pipeline

Step 1: Drag and drop assign activity.

Double click assign activity and give expression.

Note: This is input variable ($body/ttur:RequestReportName/ttur:accessToken)

Step 2: Create one variable and mention in variable part.

Step 3: Drag and drop Transport Header in inside service callout.

Double click Transport Header and select direction.

Step 4: Create one Authorization header name and give expression.

Step 5: Give expression.

Note: (Expression: fn:concat('Bearer ',$varAccessToken))

varAccessToken is variable.