How do I fix the “Missing Purchase Value parameter” in my Facebook Pixel helper?

This parameter error occurs when your pixel initialization script fires before your cart or thank-you page can load the dynamic currency and price variables, causing Facebook to receive null value metrics.

“This one’s almost always your pixel firing a split second before the page finishes loading the price data. I’ll fix the timing and have accurate values reporting within 24 hours for $99.”
— Jeff Bollettino, Managing Director, Ignite Conversions