Payment form stripes to be included in the iframe for any security concerns?

I have a project that connects different companies that can sell their own products in my application, and the payment gateway I used is Stripe. They connect their stripe account to my app via Stripe Connect and I charge them.

Now, I would like users to embed a payment form on their site, as well as through an iframe. Are there any security issues I should be aware of?

Note. I use Stripe.js to process payments, so I don't have to worry about PCI compliance

thank