How to reconcile orders in case of missed Webhooks?

[mosattler]

The Shopify documentation states
> Webhook delivery isn't always guaranteed. You should therefore implement reconciliation jobs to fetch data from Shopify periodically. - https://shopify.dev/docs/apps/webhooks#limitations

So what's the recommended way to implement periodically running reconciliation jobs. for public apps? As far as I am aware, there is no support for CRON jobs or similar functionality. 
As far as I am aware, the can also only access the Admin API when a user is currently logged in. If I just run a script somewhere, I do not have the necessary credentials to do a 

[mosattler]

Hey Web3_rise - so are sessions synonymous with App installations in this context?