Merge pull request #451 from influxdata/billing

add Billing doc

content/v2.0/cloud/account-management/billing.md

@@ -0,0 +1,74 @@
+---
+title: Add payment method and view billing
+list_title: Add payment and view billing
+description: >
+  Add your InfluxDB Cloud payment method and view billing information.
+weight: 103
+menu:
+  v2_0_cloud:
+    parent: Account management
+    name: Add payment and view billing
+---
+
+## Manage your InfluxDB Cloud payment and billing information
+
+- Hover over the **Usage** icon in the left navigation bar and select **Billing**.
+
+{{< nav-icon "cloud" >}}
+
+### Add or update your {{< cloud-name >}} payment method
+
+1. On the Billing page:
+   - To update, click the **Change Payment** button on the Billing page.
+   - In the **Payment Method** section:
+      - Enter your cardholder name and number
+      - Select your expiration month and year
+      - Enter your CVV code and select your card type
+      - Enter your card billing address
+
+2. Click **Add Card**.
+
+### View Pay As You Go billing information
+
+- On the Billing page, view your billing information, including:
+  - Account balance
+  - Last billing update (updated hourly)
+  - Past invoices
+  - Payment method
+  - Contact information
+  - Notification settings
+
+### Add or update your contact information
+
+1. On the Billing page:
+   - To update, click the **Edit Information** button.
+   - In the **Contact Information** section, enter your name, company, and address.
+2. Click **Save Contact Info**.
+
+### Send notifications when usage exceeds an amount
+
+1. On the Billing page, click **Notification Settings**.
+2. Select the **Send email notification** toggle, and then enter the email address to notify. 
+3. Enter the dollar amount to trigger a notification email. By default, an email is triggered when the amount exceeds $10. (Whole dollar amounts only. For example, $10.50 is not a supported amount.)
+
+### View Free plan information
+
+- On the Billing page, view the total limits available for the Free plan.
+
+### Exceeded rate limits
+
+If you exceed your plan's [rate limits](/v2.0/cloud/pricing-plans/), {{< cloud-name >}} provides a notification in the {{< cloud-name "short" >}} user interface (UI) and adds a rate limit event to your **Usage** page for review.
+
+All rate-limited requests are rejected; including both read and write requests.
+_Rate-limited requests are **not** queued._
+
+_To remove rate limits, [upgrade to a Pay As You Go Plan](/v2.0/cloud/account-management/upgrade-to-payg/)._
+
+#### Rate-limited HTTP response code
+
+When a request exceeds your plan's rate limit, the InfluxDB API returns the following response:
+
+```
+HTTP 429 “Too Many Requests”
+Retry-After: xxx (seconds to wait before retrying the request)
+```