To set up a payment gateway on Shopify , you typically need to provide business and identity documents rather than a "txt file" for the gateway itself. However, there are specific scenarios where a .txt file or a "paper" (document) is required. 📄 1. Required "Papers" (Documents) for Payment Gateways

If you just want to test how the checkout looks without submitting official papers yet, use the : Go to Settings > Payments . If you have a provider active, deactivate it. Select (for testing) Bogus Gateway from the list.

The robots.txt file controls how search engines crawl your site. You can edit the robots.txt template within Shopify's theme code editor.