We have in offer google login module that requires specific configuration of "google app". This tutorial describes the process in new google's developer console.
In this guide you can read how to create siteKey and secretKey that are required for reCaptcha feature.
In this guide you will get an step-by-step guide related to StopForumSpam service API key that is required for module that blocks customer register form spam.
In this guide you can read how to create Amazon APP that will be a kind of bridge between your prestashop and amazon. Thanks to this "amazon login" module will work properly.
In this guide I show you how to make birthday field required in PrestaShop. If we want to make it required we need a little more development because of this field specification.
Check how to make some fields required during customer order process. This guide shows how easily you can mark some fields as required field during account creation in your shop.
This is paypal connect module for prestashop, it creates customer account and log customer to this account addon is available here: mypresta.eu/modules/social-networks/paypal-login-connect.html
if you use some kind of PayPal modules in your PrestaShop - check this guide. Here you can read (and watch videoguide) step by step guide related to own PayPal apps.
How to put "register with Facebook" button on authentication page in PrestaShop. Guide is based on cheapest facebook module by MyPresta that is available here: mypresta.eu/modules/social-networks/facebook-login-connect.html Module works with PrestaShop Cloud service and also on self-hosted prestashop installations.
Read how to create own Google Client ID code. This code is necessary for several modules like Google Connect etc.