The logs section gives you a deep knowledge of all the activity around your APIs integrations:
It includes all your API calls and webhooks requests; as well as the authentication flow for APIs using OAuth. You can search through logs, filter by API or even by request type.
You can search inside the full request and response of each request. That includes the path, the query parameters, the body and the headers. That also includes your API calls and webhooks; as well as the authentication (for APIs using OAuth).
The data retention depends on your Bearer account. See you plan details to have the right data retention period of your account.
Bearer truncates the request and response bodies to 32kb each.