curl --request POST \
  --url https://api.upwell.com/api/rest/customers \
  --header 'Content-Type: application/json' \
  --data '
{
  "input": {
    "addresses": {},
    "addressesLastUpdatedAt": "2023-11-07T05:31:56Z",
    "billToCustomerId": "<string>",
    "ccEmailAddresses": [
      "<string>"
    ],
    "collectorId": "<string>",
    "contacts": {},
    "contactsLastUpdatedAt": "2023-11-07T05:31:56Z",
    "customerEmailSettings": {},
    "customerIntegrationSettings": {},
    "customerRule": {},
    "deletedAt": "<unknown>",
    "emailAddress": "<string>",
    "metadata": "<unknown>",
    "name": "<string>",
    "paymentLineItems": {},
    "remittanceLineItems": {},
    "sourceSystem": "<string>",
    "sourceSystemId": "<string>"
  }
}
'

{
  "createCustomer": {
    "addresses": [
      {
        "city": "<string>",
        "id": "<string>",
        "stateOrProvince": "<string>",
        "streetLine1": "<string>",
        "streetLine2": "<string>",
        "zipOrPostalCode": "<string>"
      }
    ],
    "balance": 123,
    "billToCustomerId": "<string>",
    "ccEmailAddresses": [
      "<string>"
    ],
    "createdAt": "2023-11-07T05:31:56Z",
    "customerRule": {
      "dueOption": 123,
      "id": "<string>"
    },
    "emailAddress": "<string>",
    "id": "<string>",
    "metadata": "<unknown>",
    "name": "<string>",
    "overdueBalance": 123,
    "overdueInvoiceCount": 123,
    "sourceSystem": "<string>",
    "sourceSystemId": "<string>",
    "updatedAt": "2023-11-07T05:31:56Z"
  }
}