Samsung Pay for the S7 will show up in the Play Store on March 11, but you can sideload the APK now, no problem, according to Android Police.
If Verizon don't sort this out soon they'll be committing suicide. Ask those fortunate to be able to use samsung pay with be leaving to go to competitors -some of whome are offering 2 for 1 offers.
I rad that support should come on the official release date of March 11th.
The phone hasn't been officially released yet, so Samsung Pay not being compatible isn't too outlandish.