When using Invoice Me, there are no changes in the ability to sell Add-Ons with your Collections or Classes. 

However, it is possible to prevent an Add-On from being available when using Invoice Me if desired.

To prevent an add-on from being available or sold with a fee that allows Invoice me select the option labeled 

Suggested Article for creating and editing 

Create Fees for Invoice Me

Add-Ons with Invoice Me

Enable the Gift Cards feature

Sell a Gift Card

Set an expiration date for Gift Cards

Edit a Gift Card

Share a direct link to purchase Gift Cards

View Gift Cards Status

View Gift Card History

Refund a Gift Card

Search for a Gift Card

Disable a Gift Card

Hide Gift Cards From Public Pages

Redeem Gift Cards

Gift Cards

Ludus Manual

Getting Started

Add an Event

Upload Cover Graphic to Event

Attach a Form to an Event

Add an Event About Page

Turn Your Event On and Off

Enable "Coming Soon" or "View Only" Mode On an Event

Hybrid Events

Enable Seat Buffering

Edit an Event

Copy an Event

Set up Tiered or Premium Reserved Seating

Limiting Tickets for Events

Name Your Own Price Tickets

Create Pricing For a Specific Event Time

Copy Ticket Prices From One Event to Another

Edit Ticket Price

Create Password Protected Pricing

Delete a Ticket Price

Recover Deleted Ticket Prices

Grayed Out or Missing Ticket Prices

Attach a Form to a Ticket Price

Attach Meal Options to Ticket Prices

Set up Early Bird Pricing

Custom Fees on Tickets

Ticket Prices

Add a New Event Time

Edit an Existing Event Time

Attach a Subtitle to an Event Time

Manually Mark an Event Time as Sold Out

Mark an Event Time as Admin Only

End Times for Events

Change the Seating Chart or Capacity for a Specific Event Time

Enable Arrival Times

Event Times

Reset an Event Trigger

Set Triggers on an Event

Printed Tickets

Digital Tickets

Will Call Tickets

Limit Ticket Retrieval Options for Patrons

Ticket Retrieval Options

Ticket Transfer FAQ's

Enable and Disable Ticket Transfers

Patron-to-Patron Ticket Transfers

Set Up Arrival Times

Track Access Code Usage in Reports

Access Codes

Send an Email to Ticket Holders

Schedule an Automated Email for Ticket Holders

Event Messaging

Set Up Event Categories

Event Category Manager

Edit/Delete Event Categories

Add/Remove an Event From a Category

Link to a Category

Event Categories

Create a Reservation

View Reservation List

Edit a Reservation

Release or Unreserve Seats

Sell Reserved Seats

Apply a reservation template to an event

Reservations

Extra Income and Ads

Add an ad/graphic to tickets

Edit/delete and ad from tickets

Copy a ticket ad from another event

Ad Manager

Event Printables

Ludus Protect

Enable or Disable Refund Protection

Create Referral Links

Share an Event

Sort Events

Look Up a Past Order

Refund or Release an Order

What happens if I request to refund a patron's fees?

Exchange an order

Upgrade or Downgrade an Order

Resend order confirmation email

Reprint/resend a ticket order

Apply Student Credit to an order

Edit patron details on an order

Add notes to an order

Order Details

Check-In/Scan Tickets for an Event

Preview Your Event

Rescheduling/postponing or canceling an event

Event FAQ's

Comp/Free Student Tickets

Graduation Tickets

Set up a School Dance (Prom)

Silent Auctions

Event Tips and Tricks

Events

Add a Collection

Attach a Form to a Collection

Place limits on a Collection

Edit a Collection

Copy a Collection

Sort Collections

Add Fees to a Collection

Edit Fees on a Collection

Sort Fees for a Collection

Delete Fees on a Collection

Settings for Collection Fees

Attach a Form to a Fee

Collection Fees

Set Triggers on a Collection

Create an Access Code for Collections

Edit an Access Code for Collections

Copy Access Codes from another Collection

Disable an Access Code for Collections

Limit usage on Access Codes for Collections

Collection Access Codes

View Collection submissions

Message all purchasers for a Collection

Enable Coming Soon mode for a Collection

Share a Collection

Archive a Collection

Raffles

Sell Advertisements for a Program

Set up a Summer Camp

Collection Tips and Tricks

Collections

Add a Class

Attach a Form to a Class

Enable "Coming Soon" mode for Classes

Place limits on a Class

Edit a Class

Copy a Class

Add Fees to a Class

Edit Fees on a Class

Sort fees for a Class

Delete Fees for a Class

Attach Fees to a specific Class Time

Choose Adult versus Under 18 Registration Fees

Restrict access for Class Fees

Attach a Form to a Class fee

Settings for Class Fees

Class Fees

Add a Class Time

Edit a Class Time

Delete a Class Time

Set up recurring Class Times

Customize how a Class Time is displayed

Make Class Time admin only

Mark Class Time as full

Override total attendee slots for single Class Time

Class Times

Set Up Categories for Classes

Classes Category Manager

Edit/Delete Classes Categories

Add/Remove an Class From a Category

Class Categories

View/Edit Student Profile

Ask questions of Class registrants (Student profiles vs. Form submissions)

Student profiles

Set Triggers on a Class

Create an Access Code for Classes

Edit an Access Code for Classes

Copy Access Codes from a previous Class

Disable an Access Code for Classes

Limit Usage for Access Codes for Classes

Class Access Codes

Print a Class roster

Global Class Roster

View a Class roster

Send a standard message for Classes

Send an automated message to Classes

Additional Parties

Messaging for Classes

Share a Class

Sort Classes

Printables for Classes

Archive a Class

Can I add a policy acknowledgment to my registration?

Classes

Enable donations

Process a donation

Donations

Fundraising