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Can you please share more information on the Android project? Did you receive an invitation to join a project created in Visa Developer? Is so, please send an email to firstname.lastname@example.org and include the project name and the person who invited you to the project. Thanks.
Please visit the below link for information on how to use Visa Checkout.
Please note that in order to use Visa Checkout, you will need to work with a partner in order to integrate Visa Checkout into your project. You can find the list of Partners to integrate with Visa Checkout here.