const options = {
  method: 'GET',
  headers: {'X-Spree-Seller-Id': '<x-spree-seller-id>', Authorization: 'Bearer <token>'}
};

fetch('http://{defaultHost}/api/v3/seller/delivery_methods/{id}', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

curl --request GET \
  --url http://{defaultHost}/api/v3/seller/delivery_methods/{id} \
  --header 'Authorization: Bearer <token>' \
  --header 'X-Spree-Seller-Id: <x-spree-seller-id>'

{
  "id": "dm_UkLWZg9DAJ",
  "name": "My courier",
  "code": "UPS_GROUND_79",
  "estimated_transit_business_days_min": null,
  "estimated_transit_business_days_max": null,
  "digital": false,
  "pickup": false,
  "pickup_point": false,
  "admin_name": null,
  "storefront_visible": true,
  "tracking_url": null,
  "created_at": "2026-01-15T12:00:00.000Z",
  "updated_at": "2026-01-15T12:00:00.000Z",
  "rules": [],
  "editable": true,
  "delivery_profile_id": "fp_UkLWZg9DAJ",
  "delivery_zone_id": null,
  "calculator_type": "flat_rate",
  "calculator_preferences": {
    "amounts": {},
    "amount": "10.0",
    "currency": "USD"
  }
}