Prestashop lot of error fixed by this. 
Installed module and site  prestashop and 502 Bad Gateway error displayed

Display “Add to cart”  button with  quantity field.   in products list , home page , search page products categories and all catalog . module configuration many option . fast orders . Latest module

Affiliate marketing focusing on increasing your sales and profit, in Sweden and internationally

This is a module that we really think should be Prestashop standard function. Let me explain why this is a MUST HAVE MODULE, if you make changes on your frontend now and then

Beautiful email templates for prestashop 1.5, prestashop 1.6, prestashop 1.7, prestashop 8.x . 
 Encourage visitors to complete purchases .

This one of the best module to Change the currency symbol and position with language .

 you need to change the dollar symbol into any other symbol or letter add in module configuration.

This module will help you keep your store nice and clean. Fix bugs, improve performance, make your backups smaller and upgrade process much faster with excessive data removed from you database.

Prestashop CMS page gallery and store details with easy short code implementation. Prestashop CMS Shortcode Gallery module comes with one click installation and gives flexibility to place these short codes anywhere in your CMS pages. You can place multiple gallery in one pages and/or you can place same gallery accross the many CMS pages using a simple shortcode.

Customize your Prestashop site’s appearance by easily adding custom CSS and JS code without even having to modify your theme or plugin files. This is perfect for adding custom CSS tweaks to your site.

This module allows you to disable and Enable  a product by  countries. A easy to use module to disable show specific products for specific countries in store front.

An easy to use module to disable show specific category for specific languages in store front. In Backoffice Every category have a disable or enable category by multi language 

Prestashop lot of error fixed by this. 
This code solved DisplayPositions getting Error 500 , Prestashop module postions error fixed.