DD Subscription - How to determine the next / last collection amount and date

Web Service Get Subscription with the additional parameter returnRenewalPaymentData.

The URL for this Webservice is Get:/rest/{client}/subscriptions/4XXXXXXXXX/?returnadditionalrenewalpaymentdata=true&sp=DSB&returnAddressTimepoint=Z

If the value is true, then it is a renewal subscription and all the information can be read in these fields:

  "renewal" : {
    "expiryDate" : "2018-06-14",
    "expiryIssueNr" : "000000353",
    "currentCycleNumberOfIssues" : 3,
    "currentCycleExpiryDate" : "2018-06-14",
    "currentCycleExpiryIssueNr" : "000000353",
    "currentCycleStartDate" : "2018-04-19",
    "currentCycleStartIssueNr" : "000000351",
    "currentCycleAcceptanceDate" : "2018-02-05",
    "currentCyclePaidAmount" : "10.49",
    "currentCycleBundlePaidAmount" : "0.00",
    "orderCurrency" : "GBP",
    "renewalDueDate" : "2018-03-07",
    "numberIssuesRemaining" : 3,
    "autoRenewal" : true,
    "autoRenewalNextPaymentAmount" : 10.49,
    "autoRenewalNextPaymentFrequencyCode" : "03",
    "autoRenewalNextPaymentDate" : "2018-05-03",
    "autoRenewalLastPaymentAmount" : 10.49,
    "autoRenewalLastPaymentFrequencyCode" : "03",
    "autoRenewalLastPaymentFrequencyText" : "3 Issues",
    "autoRenewalLastPaymentDate" : "2018-03-07"
     }