ST-Monoprice-Dual-Relay-Module | SmartThings device type and SmartApp for the Monoprice

First, we need to install the custom device type into your SmartThings account. Don't worry, this won't hurt a bit.
Go ahead and install the module, and let SmartThings set it up as a "Z-Wave Device Multichannel".
Copy the code from monoprice-11990-dual-relay-module.groovy into your clipboard.
Log into your developer account at https://graph.api.smartthings.com/ You can sign up for a new account if you don't already have one. This site is referred to as "the IDE" from here out.
Click "My Device Types", then "New Device Type", then click the "From Code" tab.
Paste in the code you copied to your clipboard, and click the "Create" button.
From the resulting page, click the "Save" button, then click the "Publish" button, and click "For Me" from the dropdown.
You've now installed the custom device type, now you need to associate it with your Monoprice relay.
SmartThings doesn't really allow you to interact with the individual switches on a multichannel device very well. So, we'll be creating two "virtual switches". These virtual switches will look like a normal on/off switch to the SmartThings app, but in reality will just be associated to one of the two switches on our relay. Congratulations, you've done it!!! You can now assign your virtual switches to a room, and toggle them on and off just like normal light switches. They can be used in other SmartApps and Routines, just like any other on/off switch.
From the IDE, click "My Devices", and click the "New Device" button.
In the "Name" field, add whatever you want this switch to be called, ie "Front Porch Light"
Leave "Label" and "Zigbee Id" blank.
For "Device ID", pick an ID that you haven't used before. I recommend using a UUID for this purpose.
Under "Type", select "Simulated Switch" from the dropdown.
Under "Version", select "Published".
Pick the correct values for your setup under "Location" and "Hub".
Leave "Group" blank.
Repeat steps 1-8 for your 2nd switch
Copy the code from dual-relay-adapter.groovy into your clipboard.
From the IDE, click "My SmartApps", then "New SmartApp", then click the "From Code" tab.
Paste in the code you copied to your clipboard, and click the "Create" button.
From the resulting page, click the "Save" button, then click the "Publish" button, and click "For Me" from the dropdown.
You've now installed the SmartApp to your account, now to set it up!
Now, grab your phone, and open up the SmartThings app.
Touch the "Marketplace" icon in the lower right of the app -- it looks like an asterisk.
Touch the "SmartApps" tab at the top of the page.
Touch "My Apps", it's at the bottom of the list.
Touch "Dual Relay Adapter".
You'll be prompted with the question "Which Dual Relay Module?". Here, select whatever you named your relay (the one with two switches).
For the "Virtual Switch to link to Switch 1?" and "Virtual Switch to link to Switch 2?" questions, just pick the virtual switches that we created above.
Assign this instance of the SmartApp a name.
Touch "Done"