Sugar Market, formerly known as Salesfusion, currently allows for the acceptance of securely transmitted data. While Sugar Market can accept the newest security protocols over SSL and TLS 1.2, which is preferred, there is also some backwards compatibility supported.
In terms of Integration, Sugar Market Servers can accept TLS 1.0-1.2. No customizations are needed from the Sugar Market Side, rather the Server will intercept the traffic as it is received and properly handle the transmission in the most secured protocol supported.
In terms of API and HMTL form submission, Sugar Market is equipped to receive traffic over SSL given some setup and the hosting of an SSL Certificate.