I am new to API explorer and trying to book modifiers/items through API explorer but couldn’t find any appropriate ways . Is there any way for booking modifiers/items just like booking services?
Currently only booking services are available to be booked with the Bookings API. We’re constantly working to improve our features based on feedback like this, so I’ll be sure to share your request to the API product team. 
We are building an appointment booking full-stack application with the use of square API. If only the booking services are available to book currently then what alternative should we follow for now. Can you provide any other suggestion so that, we can continue building our web-app with the use of square API.
If the customer want’s to add additional items that aren’t a service in your application you’ll need to create an order with the Orders API to add the catalog objects and pay for it using the Payments API. This would be in addition to using the Bookings API to book a services.
Hello,
Thank you for your response. We are trying to replicate the behavior seen in the Appointments app. In the appointment app, we are able to select a bookable service (TV Mounting) and add modifiers to it (Wire Concealment $39) and also add an item (non-bookable) “Regular Bracket” with the Appointment app.
We would like to create this same behavior where we provide the modifiers, bookable service variation, and a not bookable item to the appointment. What would be the best way to do this?
Our technicians go out to the customers and collect the payment for the booking, hence we want it all under the appointment for a single payment.
Please advise the best course of action. Our whole app is based on the assumption that this was available.
At this time the ability to add modifiers and items that will be included in the service order aren’t currently available with the Bookings API. We’re constantly working to improve our features based on feedback like this, so I’ll be sure to share your request to the API product team.