-- PORTMAN - close every old WhatsApp link (run once in phpMyAdmin, then upload the two locked pages).
-- Clears all approval and payment tokens, so no link sent before today can approve or pay anything.
UPDATE payment_vouchers SET approval_token_1 = NULL, approval_token_1_expires = NULL,
                            approval_token_2 = NULL, approval_token_2_expires = NULL,
                            approval_token_3 = NULL, approval_token_3_expires = NULL;
UPDATE credit_notes SET payment_token = NULL, payment_token_expires = NULL;