I want to change the method of payment for my download

You can manage the method by which you pay for your on-going daily data download via the Subscriptions tab.  The preferred method of payment is a monthly debit via your credit card.  You may also pay yearly in advance, or for South African residents, via monthly debit order.  To adjust your current method, please proceed as follows:

1:
Once logged in to http://online.primecharts.com , click on the Subscriptions tab.

2:
A list of download numbers and subscriptions, active and expired, will be displayed.  Click on the Action link of the subscription you wish to adjust and follow the prompts to cancel the current method.  Once successfully cancelled, you will receive a reference number.  If you do not receive a reference number, the subscription has not been cancelled.

3:
Return to the Subscription tab.  Now click on the Action link of the subscription you cancelled.  The link should show 'Renew' at this point.  You will be presented with the payment options relevant to where you reside.  Select the desired option and follow the prompts.