webhook message with shared_link

Hello Community members,

I am using webhooks V2 for listening to changes to my files/folders happening to my account and based on webhook payload after these events, I update my database. I am seeing a strange situation.

I am using https://developer.box.com/guides/webhooks/handle/verify-signatures/#verify-with-sdk to verify the message and it works fine for most of my messages but fails for messages having shared_link object in the message. Am I missing something here. I am using Box SDK using the headers sent by Box in the webhook payload. I am using primary key as well as secondary key in the verify method. 

Any ideas on what is happening ?

Thanks,
Deepak