Error after payment via Paypal

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(Note: The integration between PayPal and funnel platforms has undergone massive structural changes since this post was made in 2018.)

:rocket: April 2026 Updates: Fixing Post-Payment PayPal Errors

If your customers are experiencing an error immediately after completing a payment via PayPal today, the root cause - and the permanent fix - is very different than the outdated 2018 workarounds.

:stop_sign: What’s Changed & Deprecated

  • ClickFunnels is Deprecated: We no longer support ClickFunnels. Historically, post-payment errors were almost entirely caused by the legacy ClickFunnels 1.0 platform struggling to handle PayPal’s return data via slow IPNs or conflicting redirect scripts.
  • Legacy PayPal Apps are Obsolete: The old Funnelish PayPal v1 workaround plugins that tried to “bridge” PayPal and ClickFunnels are deprecated and should be removed from your active pages, as they will cause checkout conflicts.

:glowing_star: Up-To-Date Solution: Native PayPal Integration

Here is how you process payments flawlessly without redirect errors as of 2026:

  • Funnelish v2 (Standalone): By moving your sales flow to the native Funnelish platform, you eliminate the clunky third-party handoffs that caused post-payment errors.
  • Direct PayPal Connection: If you are looking to connect PayPal securely, it is now fully supported natively within Funnelish. The Funnelish Pay API communicates directly with PayPal Checkout.
  • Flawless Funnel Flows: This modern, direct integration works smoothly out-of-the-box with all funnel steps, including OTOs, upsells, downsells, and order bumps. No custom code or redirect hacks are needed.

:hammer_and_wrench: How to Set Up PayPal Properly Today

To ensure your customers never see a post-payment error and are correctly routed to their purchase confirmations or upsells, you need to use the modern Funnelish connection.

We have a complete, step-by-step guide on how to configure this native setup:

:backhand_index_pointing_right: How to Connect PayPal & Collect Payments in Funnelish

Hi! I just trying to pay via Paypal and on the paypal site after I have logged it and tried to pay I am getting this message:

Warning: require_once(./vendor/autoload.php): failed to open stream: No such file or directory in /var/www/html/Load.php on line 6

Fatal error: require_once(): Failed opening required './vendor/autoload.php' (include_path='.:/usr/share/php') in /var/www/html/Load.php on line 6

UPD. I have already tried to check again all settings etc. But nothing helps.

UPD 2. I even tried to add new test product inside CF and Funnelish, repeat everything. But the same error. So I think this mistake because of some PayPal settings…

UPD3 . Yeah. Trying to fix everything from my side - same error. So now I am stopping my tries to fix it and will wait for your response)

Here is my order form:

https://www.snor-doctor.club/order-form

What can be the problem?

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And in my paypal account I see that payment wasnt completed as well

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Hi @atlantadvisors sorry for delay, I answered another thread with your post :slight_smile:

Was this a temporary problem? if it is then perhaps due to a short update even though it should’t technically but could be the only reasonable answer.

If you are still facing the problem, can you try Incognito or hard refresh, because it seems working for me now :slight_smile:

Let me know how it goes :wink:

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Thank you!

I tried in incognito mode. It seems to be working now.

One question. How can I fix this page with Funnelish and what to do with buttons so make upsells work ? Because right now if I am trying to pay with paypal after first payment it is just refreshing the page.

Here is OTO page with couple options:
http://www.snor-doctor.club/oto-page-21843933

Thank you

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Yep, I see you got more than 2 products on your page, meaning you are using #yes-link-multi in that case you’ll have to check this tutorial,

https://community2.funnelish.com/t/using-clickfunnels-yes-link-multi-with-funnelish-paypal-apps/1007

Let me know how that goes :wink:

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Thank you! It works now as well;)

One more question while you here)))

So I made a test product. Named it Test 2 in CF, put a price 1.12$, it the 3rd party products Put TEST_2 ID from Funnelish. And added it in the right step in funnelish with the right price. I made a payment and see it in Funnelish. But don’t see it in CF :frowning:

How can I fix it?

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Ok, tracking issues with Clickfunnels can be caused by only two things:

  1. your Webhook URL is wrong.

  2. Your product cart ID is wrong, perhaps you have extra spaces or something…

But send me a screenshot of your Clickfunnels 3rd party product to have a look, perhaps you set some settings that broke Clickfunnels..

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Hm… I just checked that settings…

Here is screenshots… I think everything must be just fine

50
50994×1298 142 KB

and in CF

59
591332×1372 84.4 KB

And Webhook in Funnelish

37
371484×870 70.5 KB

So I dont know why it is not working…

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I tried couple more test payments (with or W/o order bump) and I am getting the same result. No tracking in CF… So now I temporary delete test product on my page, but check please what can be wrong

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Here is your problem @atlantadvisors:

imgg
imgg1332×1372 90.1 KB

Actually it’s not your fault, but we seen in many accounts that Clickfunnels breaks when you fill in that field so keep it empty and try it again,

Let me know how it goes :wink:

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Thanks! Will fix it now and try again

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