Node.js / Express js : Best practice to consume Webhook secret & type

I am working with an external API and need to consume its webhook notifications.

This external service will include in the notification a "secret", a static string for verification purpose AND "type of notification", the type can be (those are pure examples) :

• verification-approved
• verification-failed
• payment-approved
• delivery-confirmed
• etc ...

So I first have to verify if the secret matches mine then run some work (mostly database) based on the notification type.

I would like your recommendations on the optimal approach to consume these webhook notifications.

My only idea is having multiple ifs in the code, an if to check the secret and n ifs to check notification type and run the corresponding work.

Here is an example of a webhook notification :

{ enduser_id: 'xxxxxxxx',
  owner: 'xxxxxxxxx',
  type: 'verification-approved',
  created_at: '2020-11-09T19:00:35.944Z',
  notification_id: 'yyyyyyyyyy',
  secret:
   'the_secret' }