I'm starting to integrate Visa Checkout via Sanbox, I put the correct keys, when registering a user, he says that it is not possible to complete the registration, I would like to know if the environment works, or if a gateway is needed to use this service .
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A Gateway and Merchant Service Provider (MSP) is needed in order for Visa Checkout to function.
If you're interested in using Visa Checkout, please reach out to one of our Partners to integrate with Visa Checkout: https://globalcheckout.visa.com/visacheckoutPartners