There are two ways to create a checkout link in Shopify. The first way is to use the Checkout Link Generator tool, which is available in the Shopify Admin.
To use this tool, simply enter the URL of the product page in the Product URL field, and then click Generate Checkout Link. The second way is to manually create a checkout link by adding the following parameters to your product’s URL:
For example, if your product's URL is example.com/products/my-product, then your checkout link would be:
You can also add multiple products to the cart by adding multiple "add" parameters to the URL. For example, if you wanted to add two of the same product to the cart, then your checkout link would be:
If you want to add a specific quantity of a product to the cart, you can specify the quantity in the "quantity":
You can also style text in HTML using <p>, <b> and <u> tags where applicable.