> ## Documentation Index > Fetch the complete documentation index at: https://docs.drop-hub.com/llms.txt > Use this file to discover all available pages before exploring further. # Calculate what this merchant is charged for a delivery > Calculates authoritative route distance and returns the delivery price agreed with this merchant. DropHub internally verifies an eligible carrier and available driver; merchants never select or receive a carrier identifier. No calculation is persisted. ## OpenAPI ````yaml /openapi.yaml post /v2/external/shipment-price-estimates openapi: 3.1.0 info: title: DropHub External API version: v2 description: >- DropHub API v2 for Merchant, shipping-company, shipment, and OAuth 2.0 integrations. contact: name: DropHub API Governance license: name: Proprietary servers: - url: https://api-test.drop-hub.com description: Sandbox deployment with isolated data and credentials. - url: https://api.drop-hub.com description: Production deployment; production credentials only. security: [] tags: - name: Authentication description: >- Authentication, sessions, the company a principal is, and merchant API credentials - name: External Price Estimates description: OAuth-scoped transient route-distance and tariff calculation - name: External Shipments description: OAuth-scoped Merchant shipment creation, lookup, and cancellation - name: External Tracking description: Merchant-authenticated and privacy-minimized public tracking projections - name: Sandbox description: >- Tenant-bound self-service fixture lifecycle, available only on the isolated sandbox deployment - name: Webhook Endpoints description: Merchant webhook subscriptions, lifecycle, and signing-secret rotation - name: Webhook Deliveries description: Durable webhook delivery history and replay paths: /v2/external/shipment-price-estimates: post: tags: - External Price Estimates summary: Calculate what this merchant is charged for a delivery description: >- Calculates authoritative route distance and returns the delivery price agreed with this merchant. DropHub internally verifies an eligible carrier and available driver; merchants never select or receive a carrier identifier. No calculation is persisted. operationId: calculateExternalShipmentPrice parameters: - $ref: '#/components/parameters/AcceptLanguage' requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/ExternalShipmentPriceEstimateRequest' responses: '200': description: Current transient price estimate content: application/json: schema: $ref: '#/components/schemas/ExternalShipmentPriceEstimate' '400': $ref: '#/components/responses/BadRequest' '401': $ref: '#/components/responses/AuthenticationFailed' '403': $ref: '#/components/responses/AccessDenied' '404': $ref: '#/components/responses/ResourceNotFound' '405': $ref: '#/components/responses/MethodNotAllowed' '422': $ref: '#/components/responses/ValidationFailed' '429': $ref: '#/components/responses/RateLimited' '503': $ref: '#/components/responses/ProviderUnavailable' security: - oauthClientCredentials: - shipments:write components: parameters: AcceptLanguage: name: Accept-Language in: header required: false description: >- Preferred response language when a localized representation is available. schema: type: string maxLength: 64 example: en schemas: ExternalShipmentPriceEstimateRequest: type: object additionalProperties: false required: - pickup - delivery - destinationCityCode properties: pickup: $ref: '#/components/schemas/Coordinate' delivery: $ref: '#/components/schemas/Coordinate' destinationCityCode: type: string pattern: ^[A-Z0-9_-]{2,32}$ example: pickup: latitude: 24.7136 longitude: 46.6753 delivery: latitude: 24.774265 longitude: 46.738586 destinationCityCode: RUH ExternalShipmentPriceEstimate: type: object additionalProperties: false description: >- What this merchant will be charged for this delivery. DropHub's carrier decision and commercial margin are internal and deliberately absent. required: - distanceMetres - price - currency properties: distanceMetres: type: integer format: int64 minimum: 1 price: type: number format: decimal minimum: 0 multipleOf: 0.01 description: The delivery price currently agreed with this merchant. currency: type: string enum: - SAR Coordinate: type: object additionalProperties: false required: - latitude - longitude properties: latitude: $ref: '#/components/schemas/Latitude' longitude: $ref: '#/components/schemas/Longitude' Problem: type: object description: RFC 9457 Problem Details with stable DropHub extensions additionalProperties: true required: - type - title - status - code - timestamp - correlationId - requestId properties: type: type: string format: uri title: type: string maxLength: 128 status: type: integer format: int32 minimum: 400 maximum: 599 detail: type: string maxLength: 512 instance: type: string format: uri-reference code: type: string pattern: ^[A-Z][A-Z0-9_]{1,63}$ timestamp: type: string format: date-time correlationId: type: string format: uuid requestId: type: string format: uuid traceId: type: string pattern: ^[0-9a-f]{32}$ violations: type: array maxItems: 20 items: $ref: '#/components/schemas/Violation' example: type: https://api.drop-hub.com/problems/access-denied title: Access denied status: 403 detail: Access to this resource is denied. instance: /v2/external/shipments/018f2d8a-1f00-7000-8000-000000000206 code: ACCESS_DENIED timestamp: '2026-08-22T18:30:00Z' correlationId: 018f2d8a-1f00-7000-8000-000000000207 requestId: 018f2d8a-1f00-7000-8000-000000000208 Latitude: type: number minimum: -90 maximum: 90 multipleOf: 0.000001 x-java-type: java.math.BigDecimal x-postgresql-type: numeric(9,6) x-unit: decimal-degrees Longitude: type: number minimum: -180 maximum: 180 multipleOf: 0.000001 x-java-type: java.math.BigDecimal x-postgresql-type: numeric(10,6) x-unit: decimal-degrees Violation: type: object additionalProperties: false required: - field - code - message properties: field: type: string maxLength: 128 code: type: string maxLength: 64 message: type: string maxLength: 256 responses: BadRequest: description: >- The request syntax, path parameter, query parameter, or JSON document is malformed. content: application/problem+json: schema: $ref: '#/components/schemas/Problem' AuthenticationFailed: description: Authentication failed without account, token, or tenant enumeration. headers: WWW-Authenticate: $ref: '#/components/headers/WwwAuthenticate' content: application/problem+json: schema: $ref: '#/components/schemas/Problem' example: type: https://api.drop-hub.com/problems/authentication-required title: Authentication required status: 401 detail: Authentication is required for this resource. instance: /v2/external/shipments/018f2d8a-1f00-7000-8000-000000000206 code: AUTHENTICATION_REQUIRED timestamp: '2026-08-22T18:30:00Z' correlationId: 018f2d8a-1f00-7000-8000-000000000207 requestId: 018f2d8a-1f00-7000-8000-000000000208 AccessDenied: description: >- Access denied without exposing internal policy or resource ownership. The machine code is `ACCESS_DENIED`, except for two refusals that describe the caller's own session and are therefore safe to name: `ASSURANCE_REQUIRED`, when the caller holds the authority but the session has not proved a second factor, and `REAUTHENTICATION_REQUIRED`, when the session is no longer fresh enough for the operation. Both are answered by proving the session again and retrying — see `POST /v2/company-authentication/assurance-elevations`. content: application/problem+json: schema: $ref: '#/components/schemas/Problem' ResourceNotFound: description: Resource not found; existence is hidden across authorization boundaries. content: application/problem+json: schema: $ref: '#/components/schemas/Problem' MethodNotAllowed: description: The method is not supported for this resource. headers: Allow: description: Methods supported by this resource. schema: type: string content: application/problem+json: schema: $ref: '#/components/schemas/Problem' ValidationFailed: description: The request fails strict syntax or semantic validation. content: application/problem+json: schema: $ref: '#/components/schemas/Problem' RateLimited: description: The security operation is temporarily rate limited. headers: Retry-After: description: Suggested delay in seconds when available. schema: type: integer minimum: 1 content: application/problem+json: schema: $ref: '#/components/schemas/Problem' ProviderUnavailable: description: No qualified routing provider is configured; the operation fails closed. content: application/problem+json: schema: $ref: '#/components/schemas/Problem' headers: WwwAuthenticate: description: Bearer challenge for an unauthenticated or invalid-token request. schema: type: string example: Bearer securitySchemes: oauthClientCredentials: type: oauth2 description: >- OAuth 2.0 client-credentials flow for external machine-to-machine integrations. flows: clientCredentials: tokenUrl: /oauth/token scopes: shipments:read: Read Merchant-owned shipments shipments:write: Create and cancel Merchant-owned shipments webhooks:manage: Manage Merchant webhook endpoints, delivery history, and replay ````