A one-product Shopify website with only two variants: 100 mL and 30 mL, sold every 3 months and 1 month, respectively. A problem arose in how to display this in Instant, as a one-time purchase option is not available and should not be displayed. We worked around this by linking each container to only one variant, and then, as each variant was directly related to only one selling plan, this was automatically applied in Shopify!