Getting a list of selling plans for my products via API

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In my store I have a product entitled "Sensor Monitoring Kit" that has a product Id of 6825986654393 and one variant of Id 40446347542713.  I have one selling plan associated with this product which is selling plan Id 507642041 ("Delivery every 3 Days").

My question is, how can I get a list of all products in my store, the associated variants and selling plans via API?  I am not sure if I can use the REST APIs, or if I must write a GraphQL query.  If it is a GraphQL query, could I please get some assistance with the syntax?

Thank you!