If no payment address is available, the system must not assign one address to two users or ask a user to pay an unconfirmed address. The order should show that the address is pending or temporarily unavailable while the operator waits for a new allocation or manual resolution.
The GPU and IDC sites use one shared address pool. The two sites allocate from opposite ends, but a shared claim record prevents the same address from being assigned twice. When the pool is exhausted, new orders must wait or stop rather than reuse an old address.
Do not search for an old address, create repeated orders, or send payment before a confirmed address appears. Keep the order number and wait for a new allocation or an official confirmation.