Plugin Implementations

Hello,

I’m trying to add some functionality to my website, and I’m looking for the best options for all of these. Any help is greatly appreciated.

1). A plugin that will send an email reminder to customers that have a payment due on a certain day. (Currently using WooCommerce as my E-Commerce System)

2). A referral system plugin where current clients can receive a unique url and if the prospect client signs up from that unique url (which redirects to the registration page) then the current client is logged for a referral.

3). A plugin that will allow me to create a unique alert message for that specific logged in user.