Saving payment method for customer so I can create a subscription contact

[SC_Jay]

So I am making a subscription app. I need it so that when an order is created and the user is not subscribed a subscription contract is created for them, this process requires the customer to have a payment method, to get this I use:

{

      customer(id: $customerID) {

      firstName

        paymentMethods(first: 5) {

          edges {

            node {

              id

            }

          }

        }

      }

    }
I was testing this on my development store with a fresh account but payment methods is blank, even after completing the checkout. I need to know if when a checkout is completed the paymentMethod is saved, if not do I have to handle this myself and how can I do this. Many Thanks in advance I have been stuck on this for hours 

[Brian_S · Accepted solution]

Payment methods aren't going to be saved unless the customer checks out with an item in their cart that has a selling plan (ie unless they have purchased a subscription) 

[Liam]

Thanks for solving this Brian!!