SSL labs is not the definitive test of SSL certificates. In addition, you are susceptible to DROWN attacks: https://test.drownattack.com/?site=dmpayment.com

This certificate has been in place for less than 3 months, and it only gives you a DV cert vs. the much more desirable EV certificate. When you're asking for payment and personal information from people all over the world, you shouldn't take the cheap route for security and public accountability.