After creating API project and configuring/adding policies in its resource, click the Debug 
icon present on the menu bar to open Debug view. The Debug view allows to intercept a message at various points of policy execution and thereby helps to analyze/modify the message at the respective break pointbreakpoint. Preferred resource and environment can be chosen from the Select a resource to debug and Environment drop-downs respectively.
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Figure 1: Adding breakpoint
Color The color of the route turns red representing the breakpoint.
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After sending messages from all the breakpoints or after every policy execution, the final response is sent to App End point Endpoint and it turns green.
Figure 4: APP displayed in green font on receipt of the final response
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If an error occurs while executing a policy, the border of the policy node turns red and the debug process is stopped to send the response/error message directly to App end pointendpoint.
Figure 5: Border of the Policy node turning red indicating error in policy
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Click the 
icon present at the upper-right corner of the screen. Message panel appears to start over the debug process again as shown in Figure 2.
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Click the refresh 
icon on the top upper-right corner to refetch fetch the API project again and reload the debug panel.
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