PHP Compatibilty issues with double underscore prefixes

I got caught by this bug and fixed it by replacing __toJSON to with toJSON everywhere (e.g.)

$transaction->payload[REQUEST_TIME] = $response->__toJSON();

with

$transaction->payload[REQUEST_TIME] = $response->toJSON();

I'm new to this project, but is there a way to check the stripe library and picking which method to use depending on the library found?