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## Resource: Sample Flows

## Article: Sample Flows

## Article Link: https://dev.wix.com/docs/api-reference/business-solutions/bookings/policies/booking-policy-snapshots/sample-flows.md

## Article Content:

# Booking Policy Snapshots API: Sample Use Cases and Flows

This article shares a possible use cases you could support,
as well as a sample flow that could support it.
This can be a helpful jumping off point as you plan your implementation.

## Notify business owners of bookings under outdated policy

You could give business owners an overview of all bookings made under an
older version of a service policy.

To display a list of bookings with outdated booking policy:

1. Listen to *Booking Policy Updated*
   ([SDK](https://dev.wix.com/docs/sdk/backend-modules/bookings/booking-policies/on-booking-policy-updated.md) | [REST](https://dev.wix.com/docs/rest/business-solutions/bookings/policies/booking-policies/booking-policy-updated.md)).
1. Retrieve all services that are using the affected policy with *Query Services*
   ([SDK](https://dev.wix.com/docs/sdk/backend-modules/bookings/services/query-services.md) | [REST](https://dev.wix.com/docs/rest/business-solutions/bookings/services/services-v2/query-services.md)).
   Make sure to pass the relevant policy ID from the previous step as filter.
1. Use *Query Extended Bookings*
   ([SDK](https://dev.wix.com/docs/sdk/backend-modules/bookings/extended-bookings/query-extended-bookings.md) | [REST](https://dev.wix.com/docs/rest/business-solutions/bookings/bookings/bookings-reader-v2/query-extended-bookings.md)).
   For appointment-based service include `bookedEntity.item.slot.serviceId` in
   the filter. For classes or courses include `bookedEntity.item.schedule.serviceId`
   in the filter. You may use a conditional `or` for both filter options in a
   single call.
1. Retrieve the policy snapshots for the affected bookings with
   *List Policy Snapshots By Booking Ids*
   ([SDK](https://dev.wix.com/docs/sdk/backend-modules/bookings/booking-policy-snapshots/list-policy-snapshots-by-booking-ids.md) | [REST](https://dev.wix.com/docs/rest/business-solutions/bookings/policies/booking-policy-snapshots/list-policy-snapshots-by-booking-ids.md)).
1. Create a summary of these bookings, highlighting the policy changes for each booking.
1. Send the summary to the business owners.