고객 생성

curl --request POST \
  --url https://xapi.bolta.io/v1/customers \
  --header 'Authorization: Basic <encoded-value>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "identificationNumber": "<string>",
  "organizationName": "<string>",
  "representativeName": "<string>",
  "taxRegistrationId": "<string>"
}
'

{
  "customerKey": "<string>",
  "identificationNumber": "<string>",
  "organizationName": "<string>",
  "representativeName": "<string>",
  "taxRegistrationId": "<string>",
  "certificate": {
    "issuedAt": "<string>",
    "expiresAt": "<string>"
  }
}