ALTER TABLE orders ADD COLUMN IF NOT EXISTS payment_method VARCHAR(20) NOT NULL DEFAULT 'cod';
ALTER TABLE orders ADD COLUMN IF NOT EXISTS heleket_uuid VARCHAR(64) NOT NULL DEFAULT '';
ALTER TABLE orders ADD COLUMN IF NOT EXISTS heleket_order_id VARCHAR(128) NOT NULL DEFAULT '';
ALTER TABLE orders ADD COLUMN IF NOT EXISTS heleket_payment_url TEXT NOT NULL DEFAULT '';
ALTER TABLE orders ADD COLUMN IF NOT EXISTS heleket_payment_status VARCHAR(50) NOT NULL DEFAULT '';