Go the GoCardless Dashboard (Sandbox or Production) and sign in with your user details.
Figure 1 | GoCardless Sign In
On the dashboard, you can see your Bank Accounts and on the left-hand side menu, you have links for your Customers, Payment and Payouts.
Figure 2 | GoCardless Dashboard
Click on 'Customers', to see all the Customers that have been added once they have clicked on the PayLink or Billing Request Link and completed the Mandate creation process.
Figure 3 | Customers List
Once you select a Customer, you can see their details and drilldown on the Bank Account to see the Mandate.
Figure 4 | Customer Details
From the Bank Account page, you can then drilldown onto the Mandate.
Figure 5 | Customer Mandate Drilldown
On the Mandate page, you can see the details of the Mandate, but also the Payments, Subscriptions and Instalment Schedules that have been created from the Mandate.
Figure 6 | Customer Mandate Details