Post-payment rejection is the expensive failure mode
When validation happens after payment, a rejected order triggers refunds, re-entry, and patient delays. At refill-day volume, a handful of post-pay rejections per week is a real operational tax — especially when margin was quoted to the patient before the pharmacy declined the SIG.
Promise's public site does not describe pre-submit validation, so ask directly: when does the platform tell you a SIG is invalid or a prescriber is not licensed in a state — before or after you pay? Request a demo where an intentionally invalid order is entered to see exactly when the error appears.