Payment Test Form - String Generator (Vendor Format: &key=secret)

Important – Vendor Rule Applied
• goods_list and email are excluded from signature
• Secret is appended as &key= + secret (matches vending machine)
• Change any field → click "Generate String" (or auto on load)
• Copy string below → paste into MD5 tool → get lowercase hash
• Paste hash into "Signature (sign)" field → submit