One product per checkout — by design
bookto checkout is built around one payment link per product. There's no shopping cart where buyers add multiple products and pay once. This keeps the flow simple, fast, and conversion-friendly: buyer clicks link, pays, done.
Selling a combination? Create a bundle as one product
If you want to sell several things together (e.g. "Workshop + workbook + 1-hour coaching call"), create a single bundle product with one combined price. In the description, list what's included. The buyer pays once, and you handle delivery of the separate items on your end.
Why this matters
If you have ten products and a buyer wants three of them, they'll need to pay three times — once per link. For most one-person businesses (workshops, courses, deposits, single-item sales) this is fine. If you regularly sell combinations, bundles are the cleanest workaround.