Chargebee is a PCI Level 1 certified recurring billing platform for subscription based SaaS and eCommerce businesses. Chargebee integrates with the leading payment gateways like Stripe, Braintree, PayPal etc. around the world to let you automate recurring payment collection along with invoicing, taxes, accounting, email notifications, SaaS Metrics and customer management.
Mailchimp is an extensive email marketing tool, and probably the most versatile out there! Targeted campaigns, newsletters, and automated messages together with a broad range of excellent and customizable templates and pre-made campaigns will make this a breeze!
PieSync integrates Mailchimp with other apps for an automatic 2-way subscribers sync. Every time a subscriber is added in Mailchimp, or it gets updated, it is automatically synced with the other app, and vice versa - eliminating import/export!
Typically, CRM's only support one-way, manual pushes of contacts into Mailchimp lists. In contrast, PieSync syncs in real time, all the time, and it goes 2-way, supporting tags & groups!