How to remind customer / account for replenishing their consumable product using last invoice date ?

How to remind customer / account for replenishing their consumable product using last invoice date ?

I sell consumables for various business. 

I would like to send a reminder 30 days from the last invoice date of an customer / account.

Any easy way / ideas to accomplish sending a remainder email to my customer 30 days from their last invoice. 


I am proficient in Zoho API as well, but have challenges on doing the above.

Looking for some pointers / ideas to start coding it . Doesn't seem  that they have an out of the box funtionality to accomplish this easily. Also, multiple field search query (where clause) is also not available on zoho crm api.

Regards
Prasanna