Stripe Ruby - Find existing customer by ID and add a plan

Question

So the Stripe docs say:

Once you've created a customer, you should store its id in your own database so you can refer to it later when communicating with stripe.

Okay, easy enough. My question is: how do I find a customer by their ID? UPDATE like this:

customer = Stripe::Customer.retrieve(id)

When I sign up a new customer for one of my services I create a new Stripe Customer, but if they are an existing customer I'd like to use their existing account and simply add a plan. How do I find them and add a new plan? I looked through the docs and the ruby gem but couldn't figure it out. Help please? Here's the method in question.

def social_signup
    token = params[:stripe_token]
    if current_vendor.stripe_id == nil
        customer = Stripe::Customer.create(
            :card => token,
            :plan => 'social',
            :email => current_vendor.email
        )

        current_vendor.update_attributes(stripe_id: customer.id)
    else
        customer = Stripe::Customer.retrieve(current_vendor.stripe_id)
        # bill the customer's existing account for the added subscription
    end

    redirect_to :somewhere
end

Answer 1

Find a customer:

customer = Stripe::Customer.retrieve(current_vendor.stripe_id) # pass in the persisted ID

Create a new subscription to a plan:

customer.subscriptions.create(plan: "social")

The docs are pretty thorough, just had to dig through and find the specifics. Incidentally, adding multiple subscriptions for a single customer was a feature that Stripe added in February of this year.