To make a web service for working with rest api Sendpulse

Good afternoon. You need to make a web service in php to send contact to service email newsletters Sendpulse. At the entrance comes a POST request with the group number, name, phone and email (or only email), you need to take those contacts and send Sendpulse. If the number of the group came, we sent in a pre-zadannuyu group.

Link to API:
https://sendpulse.com/ru/integrations/api

The link to the service:

https://sendpulse.com/ru/integrations/api/bulk-email#add-email

Write your cost and time for the task.