nl_tokens: Gets a JSON version of a User - Agent and uses a cached version for a slight speed advantage .
pl_tokens: function ( cb ) { if ( Stripe . USER_AGENT_SERIALIZED ) { return cb ( Stripe . USER_AGENT_SERIALIZED ) ; } this . getClientUserAgentSeeded ( Stripe . USER_AGENT , <mask> ( cua ) { Stripe . USER_AGENT_SERIALIZED = cua ; cb ( Stripe . USER_AGENT_SERIALIZED ) ; } ) }