How can I start accepting the XRP currency as a payment through your platform?

Good to see you here in the Community, @jswindler88.

You can use and turn on the  Multicurrency feature to receive and make payments with a foreign currency.

When recording transactions with a different currency, we're able to use the home currency bank account or the bank account with the currency that matches the invoice.

First, create a clearing account using your home currency:

1. Select Accounting on the left pane.

2. Under Chart of Accounts, click New.

3. Choose Bank under the Account Type.

4. Select your home currency

5. Enter the needed details.

6. Leave the Balance blank.

7. Click Save and Close.

Once done, we'll have to record the payment of the foreign invoice. In the Receive Payment window, set the Deposit To field to your home currency. Before saving the transaction, take note of the home currency amount displayed at the bottom right.

Check out this article for more details: Set up a clearing account. This article is for QuickBooks Desktop however, the information can be used for QuickBooks Online.

That information should get you on the right track. I'd be delighted to answer other questions should you have any. Cheering you for continued prosperity.