Payments

Stripe Elements is one of those integrations that looks simple until CSP gets involved. The moment you lock down script-src, frame-src, and connect-src, your payment form can go from “works great” to “card field is blank and nobody knows why.” I’ve seen teams waste hours debugging this because Stripe is doing exactly what it should do: loading payment UI in isolated iframes, talking to Stripe APIs, and sometimes pulling in supporting assets from Stripe-controlled domains. CSP needs to allow that behavior without turning your policy into a giant wildcard mess. ...

I’ve seen this exact failure more than once: marketing drops in a Stripe pricing table, everything looks fine locally, then production CSP quietly blocks it and the page ships half-broken. The annoying part is that Stripe’s pricing table is simple to embed, but CSP rarely is. If your site already has Google Tag Manager, analytics, consent tooling, and a reasonably locked-down policy, adding one more third-party script can turn into a guessing game fast. ...

Google Pay is one of those integrations that looks tiny in code and then immediately punches a hole through your CSP if you guessed the source list wrong. You add a payment button, load the Google Pay JavaScript, open a payment sheet, and suddenly the browser starts yelling about blocked scripts, frames, or network connections. I’ve dealt with this enough times that I now treat payment integrations as CSP work first and feature work second. ...