Create or update a commitment

curl --request POST \
     --url https://app.amberflo.io/payments/pricing/amberflo/customer-commitment/true_up_by_usage_commitment \
     --header 'accept: application/json' \
     --header 'content-type: application/json' \
     --data '{
     "type": "true_up_by_usage_commitment",
     "customerId": "",
     "planId": "",
     "label": "",
     "cycles": 0,
     "usageTrueUp": {
     "productItemIdToUsage": "",
     "interval": ""
     },
     "reward": {
     "value": "",
     "label": ""
     },
     "exitClauses": {
     "type": "termination_grace_period",
     "gracePeriodInDays": 0
     }
     }'