curl --request GET \
  --url https://connect.withvayu.com/customers/externalId/{externalId} \
  --header 'Authorization: Bearer <token>'

{
  "customer": {
    "name": "<string>",
    "id": "<string>",
    "createdAt": "2023-11-07T05:31:56Z",
    "updatedAt": "2023-11-07T05:31:56Z",
    "aliases": [],
    "contacts": [
      {
        "name": "<string>",
        "email": "<string>",
        "title": "<string>",
        "phone": "<string>",
        "receiveInvoiceEmail": true
      }
    ],
    "source": "Stripe",
    "legalName": "<string>",
    "taxIds": [],
    "taxId": "<string>",
    "cloudProviderSettings": {
      "cloudProvider": "AWS",
      "cloudProviderMarketplaceId": "<string>",
      "customerIdentifier": "<string>"
    },
    "externalId": "<string>",
    "customerErpId": "<string>",
    "address": {
      "country": "<string>",
      "city": "<string>",
      "addressText": "<string>",
      "state": "<string>",
      "postalCode": "<string>"
    },
    "salesForceAccountId": "<string>",
    "dueDays": "END_OF_MONTH",
    "currency": "USD",
    "customFields": [
      {
        "vayuCustomFieldName": "<string>",
        "valueType": "String",
        "integrationSource": "NetSuite",
        "integrationEntityType": "Account",
        "fieldPath": "<string>",
        "value": "<unknown>"
      }
    ],
    "subsidiary": "<string>",
    "totalOutstandingAmount": 123,
    "openAmount": 123,
    "overdueAmount": 123,
    "pendingPaymentAmount": 123,
    "paidAmount": 123
  }
}