10419 – Express Checkout PayerID is missing.

That can happen for a couple of different reasons. Basically what’s happening is you’re losing your session data for some reason.

In most cases it has to do with caching or CDN plugins installed on the server directly or in WordPress as a plugin. Do you know if you’re running anything like that?

Another thing that can cause this is if your site starts on https:// before you redirect to PayPal and are then sent back to https:// or vice-verse.

Can you look into those things and let me know if that may be the case?

I disabled our CDN and it seems to be working.

The CDN we are using is CloudFlare. Have you had any experience with your other users using a CDN and PayPal Express?

I know they’ve been able to get it working, but I’ve never worked directly with anybody so I can’t give you any good tips, unfortunately.

I think it’s just a matter of adding the pages on the site you don’t want cached into a list somewhere in the CDN settings or something, and then you’d want to add the dynamic pages involved with WooCommerce checkout.

Sorry I don’t have better info for you, but at least we found the culprit. I would reach out to CloudFlare and see if they can help you get it working well with WooCommerce in general. Let them know you’re losing session data when getting sent to PayPal and back and they should be able to help you configure the CDN so that doesn’t happen anymore.

I’m going to go ahead and close this ticket, but let me know if you have any other questions or concerns.

Thanks for your help, this has been helpful.

I will look into Cloudflare and contact them as I believe this is probably a common issue.

Thanks again!

I’m having the exact same problem. I’ve disabled all caching and I’m not using a CDN. I’ve been working on this for a week and it’s about to drive me crazy.

Any other options to look at?

Are you absolutely sure you aren’t using such a service? Sometimes the hosting provider could be doing it without you even realizing it. Who are you hosting with and what sort of a hosting plan is it?

Thanks for responding!

I’m using SiteGround WordPress hosting. It does include caching but I have it disabled from the hosting control panel and I’ve also disabled the caching plugin and commented out the server side caching in my htaccess.

When I test my site at pingdom.com I get a score of 24 for caching, so it does appear there may be something still caching somewhere. But I sure as heck can’t find it. lol

Support verified that caching is off.

A missing Payer ID means that something is interfering with the session data, which is how that gets passed around.

The only things I’ve seen cause this would be caching / CDN services, or a plugin that is doing something with session data in WordPress. Do you have anything like that?