Using a token (4.10.3)

purchase = {
  currency: "USD",
  account: {
    code: account_code,
    billing_info: {
      token_id: rjs_token_id
    },
  },
  subscriptions: [
    { plan_code: plan_code }
  ]
}

invoice_collection = @client.create_purchase(body: purchase)

let purchaseReq = {
  currency: 'USD',
  account: {
    code: accountCode,
    billingInfo: {
      tokenId: rjsTokenId
    }
  },
  subscriptions: [
    { planCode: planCode },
  ]
}

let invoiceCollection = await client.createPurchase(purchaseReq)

purchase = {
    "currency": "USD",
    "account": {
        "code": account_code,
        "billing_info": {"token_id": rjs_token_id},
    },
    "subscriptions": [{"plan_code": plan_code}],
}
invoice_collection = client.create_purchase(purchase)

PurchaseCreate purchase = new PurchaseCreate();
purchase.setCurrency("USD");

AccountPurchase account = new AccountPurchase();
account.setCode(accountCode);
purchase.setAccount(account);

BillingInfoCreate billing = new BillingInfoCreate();
billing.setTokenId(rjsTokenId);
account.setBillingInfo(billing);

List<SubscriptionPurchase> subscriptions = new ArrayList<SubscriptionPurchase>();
SubscriptionPurchase sub = new SubscriptionPurchase();
sub.setPlanCode(planCode);
subscriptions.add(sub);
purchase.setSubscriptions(subscriptions);

InvoiceCollection collection = client.createPurchase(purchase);

var purchaseReq = new PurchaseCreate()
{
    Currency = "USD",
    Account = new AccountPurchase()
    {
        Code = accountCode,
        BillingInfo = new BillingInfoCreate()
        {
            TokenId = rjsTokenId
        }
    },
    Subscriptions = new List<SubscriptionPurchase>()
    {
        new SubscriptionPurchase() { PlanCode = planCode }
    }
};

InvoiceCollection collection = client.CreatePurchase(purchaseReq);