Update transaction process definition

ext/transaction-process/README.md

@@ -4,9 +4,8 @@ This is the transaction process that the Flex Template for Web is designed to wo
 The `process.edn` file describes the process flow while the `templates` folder contains notification
 messages that are used by the process.
 
-The process uses day-based booking and night-based pricing i.e. the quantity of booked units is
-defined by the number of nights in the booking. The process has preauthorization and it relies on
-the provider to accept booking requests.
-
-For different process descriptions for varying booking and pricing models, see the
-[Flex example processes repository](https://github.com/sharetribe/flex-example-processes)
+Bookings in the process are day-based. Pricing uses privileged transitions and
+the
+[privileged-set-line-items](https://www.sharetribe.com/docs/references/transaction-process-actions/#actionprivileged-set-line-items)
+action. The process has preauthorization and it relies on the provider to accept
+booking requests.

ext/transaction-process/process.edn

@@ -9,22 +9,20 @@
    :actions
    [{:name :action/create-booking,
      :config {:observe-availability? true}}
-    {:name :action/calculate-tx-nightly-total-price}
-    {:name :action/calculate-tx-provider-commission,
-     :config {:commission 0.1M}}
+    {:name :action/privileged-set-line-items}
     {:name :action/stripe-create-payment-intent}],
-   :to :state/pending-payment}
+   :to :state/pending-payment
+   :privileged? true}
   {:name :transition/request-payment-after-enquiry,
    :actor :actor.role/customer,
    :actions
    [{:name :action/create-booking,
      :config {:observe-availability? true}}
-    {:name :action/calculate-tx-nightly-total-price}
-    {:name :action/calculate-tx-provider-commission,
-     :config {:commission 0.1M}}
+    {:name :action/privileged-set-line-items}
     {:name :action/stripe-create-payment-intent}],
    :from :state/enquiry,
-   :to :state/pending-payment}
+   :to :state/pending-payment
+   :privileged? true}
   {:name :transition/expire-payment,
    :at
    {:fn/plus