tribe_tickets_buy_button()
Plugin: Event Tickets
Function: Echo remaining ticket count and purchase/rsvp buttons for a post.
tribe_tickets_buy_button
Plugin: Event Tickets
Filter Hook: Filter the ticket count and purchase button
Tribe__Tickets__Data_API::get_ticket_provider()
Plugin: Event Tickets
Method: Return Ticket Provider by Order, Product, Attendee, or Ticket ID.