Conspiracy -
And you sound like a naive person that will pay cash for his coffee so he can be tracked.From everything I've read and seen it's readily apparent the LHO acted alone. Like, it's incredibly obvious. All of the junk about the shot being impossible has been thoroughly debunked by more than one person using the same gun/optic. Hell, the last time they did it I'm pretty sure only one person failed to get it done. They recently delved into the 'magic bullet' thing and debunked that, too. Basically it amounts to deformation. Bullets deform upon contact with something solid and the second dood hit was hit by a bullet that was toppling - a sign of impact. So yeah, it's pretty cut and dried IMO.
You are safe, by using your credit card they can't track you.
Just because there was just one shooter does not make it less of a conspiracy.