Of course, there's a lot of psychology behind all good product copy. Methods of leveraging psychology include employing urgency and scarcity principles, cross-selling and up-selling, displaying trust badges, and offering free shipping and returns.
A prospect has moved your product to their cart, but this doesn't mean your work is over: Now you've got a whole new set of hurdles to clear. Shopping carts that show accurate summaries, let users edit, and offer clearly-ranked CTAs will reduce cart abandonment.
Checkout abandonment is real... but it can be rectified through better UX on your checkout pages. Good checkout UX means carefully considering the timing around account creation, answering user questions and anxieties in an enclosed checkout, and offering the fastest forms possible.
Exceptional UX on an online scheduling page means a no-distractions, no-surprises, mobile-friendly set of forms with as few fields as possible and a clear path for your prospective client. See how a few service-based businesses do all these things on their own scheduling pages.