Update onboarding status for a merchant with a specific provider. Use 'enrolling' to start enrollment or 'onboarded' to complete it.

Example response

{
  "success": true,
  "data": {
    "provider": "quidkey",
    "requirements": [
      {
        "code": "LEGAL_ENTITY_EXISTS",
        "label": "Legal entity attached",
        "met": true,
        "blocker": "Merchant must have a legal entity",
        "problems": [
          {
            "field": "company_name",
            "message": "Company name is required"
          }
        ]
      }
    ],
    "depends_on": [
      {
        "provider": "quidkey",
        "satisfied": true
      }
    ]
  }
}