Flex Microform and Unified Checkout Added 8-Digit Card Number Prefix {#micro-unified-8-bin-20531}
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**Products Included:**

* Flex Microform

* Unified Checkout  
  **Region/Country:** Global  
  **Expected Release Date:** March 2025  
  **Internal Epic Number:** 20531  
  Flex Microform and Unified Checkout will now support 8-digit card number prefixes. A new optional transientTokenResponseOptions.includeCardPrefix REST field will enable users to select whether the Capture Context returns a 6-digit, 8-digit, or no card number prefix. To select the type of card number prefix:

* No field included: A 6-digit prefix is returned. (default)

* `true`: An 8-digit prefix is returned.

* `false`: No prefix is returned.

{#micro-unified-8-bin-20531_ul_k15_swc_j2c}  
The following conditions apply:

* 8-digit card number prefixes apply only to Discover, JCB, Mastercard, UnionPay, and Visa brands with 16-digit card numbers or more.
* Any card with fewer than 16 digits will return a 6-digit prefix even when the transientTokenResponseOptions.includeCardPrefix field is set to `true`.
* Any card brand other than Discover, JCB, Mastercard, UnionPay, or Visa will return a 6-digit prefix even when the transientTokenResponseOptions.includeCardPrefix field is set to `true`.
* If any card brand is co-branded with Discover, JCB, Mastercard, UnionPay, or Visa, an 8-digit prefix will be returned if the transientTokenResponseOptions.includeCardPrefix field is set to `true`.

{#micro-unified-8-bin-20531_ul_l15_swc_j2c} IMPORTANT
If your application does not require a card number prefix for routing or purposes, set the transientTokenResponseOptions.includeCardPrefix field to ` false `. This will minimize your personal data exposure.  
For more information on 8-digit prefixes, see: [8-digit-bins-and-pci-dss-what-you-need-to-know](https://blog.pcisecuritystandards.org/8-digit-bins-and-pci-dss-what-you-need-to-know "")  
**Customer Impact**  
Merchants will need to determine the correct card number prefix format to use with their payment system. If no decision is made, the current 6-digit format will continue to be used for all cards and card lengths.