Three steps that the administrator should do to implement this functionality are:
Create an email template. An email template is a reusable message that contains merge fields that are populated with data from records when the email is sent. The administrator can create an email template for the Payment Summary object that includes information such as the payment amount, date, status, etc.
Create an email alert action. An email alert action is a type of action that sends an emailto one or more recipients when a flow executes. The administrator can create an email alert action that uses the email template created in the previous step and sends it to the owner of the associated account when a new Payment Summary is created.
Create an approval process on the Payment Summary object. An approval process is a way to automate the approval of records based on certain criteria and actions. The administrator can create an approval process on the Payment Summary object that requires an approval after review from a designated approver.
Verified Reference: https://help.salesforce.com/s/articleView?id=sf.email_templates_create.htm&type=5 https://help.salesforce.com/s/articleView?id=sf.flow_ref_elements_action_email.htm&type=5 https://help.salesforce.com/s/articleView?id=sf.approvals_creating_approval_processes.htm&type=5

The type of relationship that exists between FulfillmentOrder and Location is Many-to-One Lookup (Location) FulfilledFrom Location Id. A Lookupfield is a type of custom field that creates a relationship between two objects, but does not support rollup summary fields. A Many-to-One relationship means that many child records can be related to one parent record, but not vice versa. In this case, a FulfillmentOrder has a Lookup field named FulfilledFrom Location Id that references a Location record. A Location is a record that represents a physical location from which order product items are fulfilled, such as warehouses and retail stores. A Locationcan have many FulfillmentOrders associated with it, but a FulfillmentOrder can only have one Location. Verified Reference: https://help.salesforce.com/s/articleView?id=sf.custom_field_types.htm&type=5https://help.salesforce.com/s/articleView?id=sf.order_management_location.htm&type=5

Three advantages of using Flow Builder vs writing Apex code to manage the main flow of Order data are:
The admin can attach a debugger to live customersessions. This allows the admin to monitor and troubleshoot the flow execution in real time, without affecting the customer experience or data integrity.
The admin can easily debug specific business cases visually. This allows the admin to test the flow with different input values and see how the flow behaves in a graphical interface, without writing any code.
Because it is visual it is also self-documenting as changes are made. This allows the admin to easily understand and maintain the flow logic, as wellas track the changes and versions of the flow.
Verified Reference: https://help.salesforce.com/s/articleView?id=sf.flow_builder_debug.htm&type=5 https://help.salesforce.com/s/articleView?id=sf.flow_builder.htm&type=5