Guide users with brief cues like, “3-digit code on back,” or “Use name exactly as on card.” Accept spaces and dashes, and reveal card type automatically. This combination of subtle intelligence and supportive language reduces retries and reassures shoppers that the system understands real-world behavior and common formatting preferences.
Respect international formats and invite clarification: “Add region or province if applicable.” Provide examples for apartments, P.O. boxes, and company names. This microcopy ensures inclusive accuracy, limiting failed deliveries and last-minute confusion, and it signals global awareness, which boosts confidence for cross-border buyers considering a first purchase with you.
Explain why numbers are needed, not just that they are required: “ZIP helps us show accurate delivery dates.” If a format fails, show one correct example and accept reasonable variations. Gentle, explanatory tone preserves goodwill, turning potential friction into a quick correction rather than a reason to abandon.
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