When looking to introduce e-commerce functions to your website, which of the following would be the best first step?

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When looking to introduce e-commerce functions to your website, which of the following would be the best first step?

1. Build an online store with an integrated payment system
2. Set up a web-based money transfer software like PayPal
3. Invest in a new website platform
4. Use other platforms such as eBay or Etsy