curl --request POST \
  --url https://api.hyperline.co/v1/customers/providers-bulk-update \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
[
  {
    "customer_id": "cus_Typ0px2W0aiEtl",
    "provider_name": "mollie",
    "provider_account_id": "<string>",
    "provider_id": "<string>"
  }
]
'

{
  "successful": 123,
  "expected": 123,
  "updated": [
    "<string>"
  ]
}