How can I use Billing Config for a trial period in a Node App?

mdskrumi23
Shopify Partner
2 0 0

There is a billing object in the generated nodeJs app by Shopify CLI. I have read the billing API documentation but need help finding how to use that object. 
What is the best way to make an application free for some days at first then charge for it? Can anyone help me by giving a guideline?

Sakib
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