> For the complete documentation index, see [llms.txt](https://docs.navigaglobal.com/circulation-setup-manual/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.navigaglobal.com/circulation-setup-manual/subscription/codes-menu/cc-token-prefix.md).

# CC Token Prefix

If you allow alternate credit card numbers (tokens) to be interfaced with subscriber payments, token prefixes must be defined here. The Business Rule— ***Do you allow alternate values in the credit card field?*** (Subscriber Payments section) determine whether alternate credit card numbers are used. For example, if you are interfacing payments from ISD (Chatterbox) through the Customer Service API, you may need to store alternate credit card numbers.

If you do not allow alternate credit card numbers, this setup can be skipped.

{% hint style="info" %}
**Note:**

* *Once the Business Rule above is set to “Yes,” only credit card numbers with prefixes that match a CC Token Prefix code can be entered.*
* *A tool, `tools/isdconvert/isdconvert`, can be run from the Progress Editor to export credit card numbers to ISD and import tokenized numbers from ISD.*
  {% endhint %}

### Define credit card token prefixes

1. Select CC Token Prefix from the Setup | Subscription | Codes menu to display the Credit Card Token Prefix screen.<br>

   <figure><img src="/files/wYfr1wlZRYtVLDvWm7G5" alt=""><figcaption></figcaption></figure>
2. In the lower part of the screen, click the Add Credit Card Token Prefix icon.
3. Select the credit card type for this prefix in the Credit Card Type field. Only credit card types set up in Credit Card Account setup can be selected (see [Credit Card Account](/circulation-setup-manual/accounting/general-ledger-menu/credit-card-account.md)).
4. In the Valid Prefix field, enter the 2-digit credit card prefix. Typically the prefix is less than 10 or greater than 90 to differentiate them from real credit card numbers.
5. Click OK to add the credit card prefix.


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