Ask What's the easiest way to add a membership fee to a consumer web site?

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I'm building a consumer website and want to add a membership option. I need users to pay a fee for exclusive content. I've heard of various payment gateways and plugins, but I'm not sure which ones are best. I'm looking for a simple and secure way to handle payments. I want to integrate this feature quickly and easily. I'm hoping for advice from experienced users. What's the easiest way to add a membership fee to a consumer website?