> For the complete documentation index, see [llms.txt](https://ova-themes.gitbook.io/em4u-1/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://ova-themes.gitbook.io/em4u-1/faqs/related-booking-event.md).

# Related Booking Event

## 1: **Checkout Event Error:**

\+ Please check surely your host support **allow\_url\_fopen**

\+ **The Logo** in ticket have to use **.png**

## **2: Don't send PDF Ticket, QR Code, Cerfical File to email**

\+ Your host allow to send mail

\+ Go to Events Manager >> Settings >> Mail Template Settings and find

Attachment QR,PDF in Mail: Choose QR Code or Both not none

Attachment File Certificate in Mail: Yes

## **3: Paypal doesn't working:**

We are using IPN Paypal, so you have to enable IPN in your account and insert url here: your-domain/wp-content/plugins/ova-events-manager-paypal​/inc/update\_order.php​