Bump content sales on resource order paid; show order number/time in download box; poll pending gateway payments; support download_limit_over_price overbuy.
Wire zibll-style one-shot points/cash cashier for post+_aksrt_pay downloads: server amount from aksrt_get_user_pay_price, ORDER_PRODUCT_RESOURCE unlock, frontend need-purchase opens modal, download box purchased/VIP/purchase CTAs.