As your data processor we use a number sub-processors to provide our services. Details of the sub-processors we use with regards to your data are listed below. 

ServiceWhat we use them for
Amazon Web Services (AWS)AWS provide us with our hosting, database, and backup infrastructure. All of our servers are located in Japan.
StripeWe use stripe to process payments.
SalesforceWe use Salesforce as our crm and also use the there API interface to sync leads between our clients accounts and their Salesforce accounts.
MarketoWe use API interface provided by Marketo to sync leads between Chatbook and Clients Marketo Accounts.
Google CalendarWe use Google Calendar for the sync feature.
MailChimpWe use and store our customers emails to send to Marketing and Transactional emails.