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Alisson Xavier 
I haven't created any custom payment component, however check below references that can help you.
https://developer.salesforce.com/docs/atlas.en-us.b2b_b2c_comm_dev.meta/b2b_b2c_comm_dev/b2b_b2c_comm_lwc_for_lwr.htm
https://developer.salesforce.com/docs/atlas.en-us.blng_dev.meta/blng_dev/apex_blng_setup_gateways.htm
Also check on appexchange if there are any product that matches your requirement.
https://appexchange.salesforce.com/
Please mark as Best Answer if above information was helpful.
Thanks,
All Answers
I haven't created any custom payment component, however check below references that can help you.
https://developer.salesforce.com/docs/atlas.en-us.b2b_b2c_comm_dev.meta/b2b_b2c_comm_dev/b2b_b2c_comm_lwc_for_lwr.htm
https://developer.salesforce.com/docs/atlas.en-us.blng_dev.meta/blng_dev/apex_blng_setup_gateways.htm
Also check on appexchange if there are any product that matches your requirement.
https://appexchange.salesforce.com/
Please mark as Best Answer if above information was helpful.
Thanks,
Yes, it is possible to create a custom payment component using ClientSidePaymentAdapter in Salesforce. Here are the basic steps to do so:
Create a Lightning component: Create a Lightning component to handle the user interface for your payment component. This component should include the fields necessary for the user to enter payment information (such as credit card number, expiration date, and CVV code), as well as any other fields or functionality that you need for your specific use case.
Implement ClientSidePaymentAdapter: Implement the ClientSidePaymentAdapter interface in your Lightning component to handle the processing of the payment information entered by the user. This interface includes the methods getToken, validateToken, and chargeToken, which you will need to implement in your component.
Implement the getToken method: In the getToken method, you will need to collect the payment information entered by the user and send it to your payment gateway to generate a token. This token will be used to process the payment later.
Implement the validateToken method: In the validateToken method, you will need to validate the token generated by your payment gateway to ensure that it is valid and can be used to process the payment.
Implement the chargeToken method: In the chargeToken method, you will need to use the token generated in the getToken method to actually process the payment. This may involve sending the token to your payment gateway and waiting for a response.
Add the Lightning component to a page: Once you have created and tested your custom payment component, you can add it to a Lightning page in Salesforce so that users can use it to make payments.
Note that the specific implementation of your custom payment component will depend on the payment gateway that you are using and the specific requirements of your use case. You will need to consult the documentation for your payment gateway and Salesforce to determine the best approach for your needs.
If you find my answer helpful, please mark it as the best answer. thanks!
Where did you find out these steps?
Thanks