Which is better for hosting a payment gateway: AWS or Shared Hosting?

I'm building a payment gateway that simply processes payments using a custom payment api. Considering security and other factors, should i host it on AWS(Amazon web services) or a regular shared hosting site? What will be the pros and cons of choosing any of them? I'm also wondering whether I should build it with regular php or laravel php framework. Any comments or input will be greatly appreciated. Thanks.

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