Create Mappings

Create mappings between CRM records and NationGraph institutions.

Single Mapping Format:

{
  "company_id": "123456",
  "institution_id": "inst_abc"
}

Bulk Mappings Format:

{
  "mappings": [
    {"crm_id": "123456", "institution_id": "inst_abc"},
    {"crm_id": "789012", "institution_id": "inst_xyz"}
  ]
}

Response: Returns 202 Accepted immediately. Mappings are created in the background.