会话内客户拒绝3DS认证及租车杂费支付场景的技术咨询

1. What to do if a customer refuses to complete 3DS authentication during a session? #

• First, don’t immediately write off the payment. Politely follow up to confirm their refusal—sometimes it’s a misclick, confusion about what 3DS is, or frustration with the extra step. Frame it as a security measure to protect their card, not just a hoops-jumping exercise.
• If they stand by their refusal, here are actionable steps:
  • Offer alternative payment methods that bypass 3DS (where available)—think digital wallets like Apple Pay or Google Pay, which often use their own streamlined authentication flows.
  • Use a SetupIntent to save their payment method without charging right away. This lets you retry the 3DS authentication later via an off-session payment, but only if you have explicit permission from the customer to charge them for the original transaction.
  • Log the refusal in your system. For repeat customers, you can flag their account to prioritize alternative payment methods upfront, avoiding this friction in future interactions.
• Critical reminder: Never force or manipulate a customer into completing 3DS—it violates card network rules and opens you up to payment disputes.

2. Resolving the rental car scenario: Unable to charge incidental fees after 3DS refusal #

This is a classic pain point tied to Strong Customer Authentication (SCA) rules that underpin 3DS. Here’s how to adapt your workflow:

• Pre-authorize the full estimated amount upfront: Instead of charging the base fare first and adding incidentals later, create a PaymentIntent with capture_method: manual to pre-authorize the total expected cost (base fare + estimated incidentals) at the start of the rental. Since you’ve already completed 3DS authentication for the full amount, you can capture the exact total (including any actual incidentals) later without needing re-authentication.
• Get explicit consent for post-rental charges: If pre-authorizing the full amount isn’t feasible, make sure your rental agreement clearly states that incidental fees may be charged after the rental ends. When you need to process those fees, use the saved payment method to initiate an off-session PaymentIntent. Stripe will automatically attempt 3DS authentication; if the customer refuses, you can escalate using the signed agreement as proof they consented to the charge.
• Clarify terms early: Most refusals here stem from surprise. Spell out the possibility of incidentals and associated authentication steps in your booking flow, confirmation emails, and in-person check-in. This sets expectations and reduces pushback later.
• Note: Off-session payments have strict rules—you must have a valid business reason for charging without the customer present, and the amount must align with what the customer agreed to.

内容的提问来源于stack exchange，提问作者Obeyda