Fatal error: Class 'cloudflare_api' not found in

Instalation Amasty module (https://amasty.com/product-feed.html).

I just finished instalation according to instructions but on 6 -th step. After clicking Run Compilation Process
this error came up:
Fatal error: Class ‘Cloudflare_api’ not found in /home/zabawki/web/includes/src/DM_Cloudflare_Model_Observer.php on line 27
I spoke to Amasty guys but they have said its all up to Cloudflare.

Do anyone know how to fix it?

AFAIK there is no such class in Cloudflare’s PHP package.

Can you post the lines 20 to 40 of DM_Cloudflare_Model_Observer.php?