Are there analogues of crm justclick.ru in the English segment?

Question

API

I am engaged in the sale of musical information products. Decided to master the English segment.
The maximum task is to get the functionality of justclick.ru of a foreign service. Email-sending can be in another service (GetResponse, mailchimp etc)
Requirements for crm:
1) Must be free or no more than 15 bucks per month (negotiable)
2) Work on the API
3) Be in English
4) Must be easy to understand, have video tutorials or a cool fact
5) Have support
6) Work with authors (calculate the author's percentage of goods, send letters to authors)
7) Have an affiliate program
Are there such services?