How do I change my customer's default payment source?

Via PayDock Dashboard

1. Go to Customers
2. Search customer whose payment source you want to delete. Click on customer's name.
3. Select the payment source you want to make default.
4. Click "Set Default"
5. The payment source will now show up first under your customer's details. 

Success!

Via API request

1. Generate a new payment source for your targeted Customer
2. A simple API POST to /v1/customer/{id} by setting the default_source using the "_id"  value  found under payment_sources for that customer

   {
       "default_source":"1234567890"
   }

Success! The default_source "value" for that customer has now been changed.