EventBrite integration with F#

The Denver Dev Day organization committee was using an event-hosting website for 3 years before the company behind it was sold and their community license was revoked. Because the event is organized by the community, there was no budget to pay for the commercial license, so organizers decided to move on to use free services for the event.

However, there was one feature missing. Printing the attendee's badge right away -automagically- after scanning the attendee's ticket adds a professional touch and streamlines the check-in process.

The purpose of this project is to fill that gap.

F# Challenges

• COM-interop to use b-PAC SDK
• Generate QR code
• Invoke EventBrite API
• Subscribe to Azure message queue

Prerequisites

• Brother QL-700 Label Printer
• Brother DK-1202 Labels
• Brother b-PAC SDK
• Brother P-touch Label Designer
• EventBrite account
• Azure account

Build

• Unfortunately b-PAC SDK doesn't work with 64-bit .NET Core (or at least I didn't find how to make it work), but 32-bit version works perfectly.
• .NET Core 3.0 is supposed to bring COM interop to the .NET Core world, but the path described here didn't work either, but b-PAC COM reference is there in the project file (just commented out) for you to try. COM interop assembly works after migrating project to the .NET 6.0
• dotnet build

Configure

• Log into your Azure subscription.
• Create Service Bus Namespace and a message queue.
• Deploy Logic App using eb-integration.logicapp.json. Azure portal doesn't save connection information in the action block, therefore create a Send Message action using the service bus and selection the message queue from the drop-down list.
• Add Content parameter, set it to dynamic content, start typing api_url in the search box, but select it from the found items below. Don't forget to save your logic app!
• Log into your EventBrite account and go to the Account Settings.
• Create WebHook for barcode.checked_in action. Use URL of the Logic App you've just deployed.
• Press Test button.
• Create a new app registration under App Management.
• Copy your personal OAuth token into print-server.json EventBriteAccessToken parameter.
• Copy queue connection string into the ServiceBusQueue parameter.
• Design your badge with the P-touch editor and save it into the ./assets/templates/ folder.

Run

• dotnet run --no-build
• Or dotnet publish navigate to the publish folder and run print-server.exe