# Tokenization ### What is Tokenization ? Tokenization is a helpful feature that makes transactions easier. It works by connecting a user's account to future payments. Once someone enters their credit card details during their first transaction on the DOKU checkout page, that information is securely saved. Later on, when they make another payment, they can simply use the linked account, avoiding the need to enter their credit card details again. ### Supported Payment Channel Tokenization supported by payment channel : * Credit Card ### How to use tokenized in Checkout Page ? What you need to ensure when activate tokenization is by bring parameter `customer.id` in your initial payment request. #### Request sample : ```json "customer":{ "id":"JC-01" } ``` --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://developers.doku.com/accept-payments/doku-checkout/additional-feature/tokenization.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.