We all have been waited for a developer at some point in our life. This is our fault, we inflated their backlog by assigning tasks without cost-benefit analysis. This is another time’s subject.
Ok, I hear a voice; “This is our everyday life and we need to track conversions right away. We are pouring money on Facebook Ads.”
Then, here is the simple workaround if your website already has FB remarketing pixel which could be easily deployed by Google Tag Manager. Navigate to Custom Conversions through search box and create a custom conversion with URL rules. Just enter the URL where the sale is completed.
(If you can't see the GIF, wait a bit more or click the little icon below.)