put https://app.bitgo.com/api/v2/pendingapprovals/
Updates the state of a pending approval to approved or rejected.
You can manage pending approvals programmatically by API or with the
BigGo web UI. Ensure your authentication token has the proper scope.
When creating an access token in the web UI, check the permission,
"Update Pending Approvals" (under "Account Settings" > "Developer
Options" > "Access Tokens").
BitGo recommends that you create a webhook policy so that you can automate approving and rejecting transactions.