Require to be member of A channel

[AhyaH-YHWH]

Hi.
in addition to
TG_AUTH_USERS

creating another private channel, adding bot to it (different from Dump Channel)

if users , open bot links ,send message to bot,
bot checks to see if they are members of channel, if they are it sends file to them
otherwise, send message, "First Subscribe to Our Channel"

(There should be a flood wait, so that non-subscribers get this message, once per hour, each try)