Add it to your server
In your server's .ini file (servertest.ini by default), add these to the existing WorkshopItems= and Mods= lines, separated by a semicolon (;).
WorkshopItems=3825220364;3825220785
Mods=SpiffBoy;SpiffBoySDK
These lines include the mod it requires, as its Steam page declares it:
- SpiffBoy [B42.21] ·
SpiffBoy
| Workshop item | Subscribers | Declared in |
|---|---|---|
| SpiffBoy SDK [B42.21]3825220785 | 50 | description footer |