Get all selling plans

curl --request GET \
  --url https://www.myshop.com/apps/memberships/cp/api/subscription-groups/all-selling-plans

[
  {
    "frequencyCount": 123,
    "billingFrequencyCount": 123,
    "frequencyName": "<string>",
    "discountOffer": 123,
    "discountOffer2": 123,
    "afterCycle1": 123,
    "afterCycle2": 123,
    "discountEnabled": true,
    "discountEnabled2": true,
    "discountEnabledMasked": true,
    "discountEnabled2Masked": true,
    "id": "<string>",
    "specificDayValue": 123,
    "specificMonthValue": 123,
    "specificDayEnabled": true,
    "maxCycles": 123,
    "minCycles": 123,
    "cutOff": 123,
    "prepaidFlag": "<string>",
    "idNew": "<string>",
    "freeTrialEnabled": true,
    "freeTrialCount": 123,
    "frequencyDescription": "<string>",
    "keepOriginalNextBillingDateAfterTrial": true,
    "planSequence": 123,
    "groupName": "<string>",
    "groupId": 123,
    "memberOnly": true,
    "nonMemberOnly": true,
    "memberInclusiveTags": "<string>",
    "memberExclusiveTags": "<string>",
    "lifeTimeMembership": true,
    "rulesJson": "<string>",
    "allowedForUpgradeDowngrade": true
  }
]