To enable payment via 2 credit and debit cards in Checkout API, follow these steps:

1. In the store Control Panel, go to Stores > Configuration > Sales > Payment methods.

2. In the Mercado Pago plugin, click Configure.

3. Select the Checkout Transparent tab.

4. Click on Two debit and credit cards and complete the fields according to the following descriptions:

   1. In Enabled, choose between "Yes" or "No". This option defines whether the payment method will be available for use.
   2. In Title, define the title of how the payment method will be displayed on the store checkout.
   3. In Enable vault, select to allow the consumer to save or use the card in the future.
   4. In the Payment Action field, select between Authorization for future capture or Authorization for immediate capture. This setting will define how Mercado Pago will process the order, with "Authorization for immediate capture" being a flow that does not require any future action, in this scenario, the customer pays and Mercado Pago already withdraws the amount from the card balance. For the option "Authorization for future capture", Mercado Pago will only sensitize the value in the customer's balance and only after their manual action will the value be captured effectively.

After filling in these fields, payment via card will have been enabled in Checkout Transparent. Click Save Configuration to save the changes made or, if you prefer, proceed to the next step and configure installment and interest for cards.

In this section, you can define some general characteristics of the platform for the use of Checkout API. Fill in each of the requested fields according to the description below.

1. In the Minimum order total option, set the minimum value for an order to be processed. In this field, enter integers. The payment method will only be displayed to the consumer if the order value is equal to or greater than what you inform.
2. In Maximum order amount, set a maximum value for the order to be processed. In this field, enter integers. The payment method will only be displayed to the consumer if the order value is equal to or less than what you inform.
3. In Payment From Specific Countries, select the countries that can use this payment method. Only consumers whose payment address is from one of the countries you selected can see this payment method.
4. In the Sort Order option, set an ascending order of display for this payment method on the checkout. The lower the number you enter, the lower the position of this payment method among all others. For example, if it is 1, any other payment method with a higher order will be displayed after it.

After completing these fields, payment by card will have been enabled in the Checkout API. Click Save Configuration to save the changes made or, if you prefer, go to the next step and configure installment and interest for cards.

The installment and interest setting is made directly in your Mercado Pago account. To do so, follow the steps below.

1. Click on the Set up installments and interest button and log in to your Mercado Pago seller account.
2. Select the QR Code and Online Payments option, enable the installment and select the number of installments you want to offer at checkout. The options range from 1 to 12 times.

Done! After completing these steps, installment at checkout will be configured and ready to process sales.