Revenues from store subscription plans. Shopify's merchants pay a monthly fee for the use of its platform. The standard plans range from $29 to $299, plus a high-end plan called Shopify Plus.
Last reported quarter 2018 Q3 it was $120.50 million, up by 46% year-over-year from $82.44 million. From $188.61 million in 2016 it increased by 64% to $310.01 million in 2017.
Source: Shopify Quarterly Results.