> ## Documentation Index > Fetch the complete documentation index at: https://docs.polymorfa.com/llms.txt > Use this file to discover all available pages before exploring further. # Create testing history fixture > **Required scope:** `sandbox:write` ## OpenAPI ````yaml api-reference/features/operate.json POST /messaging/testing/{projectId}/history-fixtures openapi: 3.0.3 info: title: Operate API methods version: 1.0.0 description: Task-focused operate methods across supported Polymorfa connection types. servers: [] security: [] paths: /messaging/testing/{projectId}/history-fixtures: post: tags: - Testing summary: Create testing history fixture description: '**Required scope:** `sandbox:write`' operationId: nativeCreateTestingHistoryFixture parameters: - schema: type: string format: uuid required: true name: projectId in: path description: |- Identifier of the Polymorfa project that owns this resource. **Value constraints** | Constraint | Accepted input | | --- | --- | | Format | `uuid` | requestBody: required: true content: application/json: schema: type: object properties: messages: type: array items: type: object properties: id: type: string minLength: 1 maxLength: 128 description: |- Identifier for this resource. **Value constraints** | Constraint | Accepted input | | --- | --- | | String length | `1` through `128` characters | senderPhone: type: string pattern: ^\+[1-9][0-9]{1,14}$ description: |- Specifies sender phone for this message. **Value constraints** | Constraint | Accepted input | | --- | --- | | Pattern | `^\+[1-9][0-9]{1,14}$` | text: type: string maxLength: 4096 description: |- Text content carried by this object. **Value constraints** | Constraint | Accepted input | | --- | --- | | String length | At most `4096` characters | timestamp: type: integer minimum: 0 exclusiveMinimum: true description: |- Unix timestamp in seconds associated with this event. **Value constraints** | Constraint | Accepted input | | --- | --- | | Numeric value | Greater than `0` | fromMe: type: boolean description: Whether the connected account originated the message. required: - id - senderPhone - text - timestamp - fromMe additionalProperties: false maxItems: 100 description: |- Messages associated with this schema. **Value constraints** | Constraint | Accepted input | | --- | --- | | Array size | At most `100` items | required: - messages additionalProperties: false responses: '201': description: Project-scoped history fixture content: application/json: schema: type: object properties: fixtureId: type: string format: uuid description: |- Identifier for the fixture. **Value constraints** | Constraint | Accepted input | | --- | --- | | Format | `uuid` | required: - fixtureId '400': description: Invalid fixture content: application/json: schema: $ref: '#/components/schemas/native__PublicError' example: error: type: invalid_request_error code: invalid_parameter message: Correct the invalid request field. param: null data: null docs: https://docs.polymorfa.com/api/errors#invalid-parameter '403': description: Test access required content: application/json: schema: $ref: '#/components/schemas/native__PublicError' example: error: type: permission_error code: permission_denied message: The credential does not have access to this resource. param: null data: null docs: https://docs.polymorfa.com/api/errors#permission-denied '404': description: Project not found content: application/json: schema: $ref: '#/components/schemas/native__PublicError' example: error: type: invalid_request_error code: resource_not_found message: The resource is unavailable to this caller. param: null data: null docs: https://docs.polymorfa.com/api/errors#resource-not-found '502': description: Test runtime unavailable content: application/json: schema: $ref: '#/components/schemas/native__PublicError' example: error: type: upstream_error code: upstream_failure message: The messaging provider could not complete the request. param: null data: null docs: https://docs.polymorfa.com/api/errors#upstream-failure security: - native__BearerAuth: [] servers: - url: https://api.polymorfa.com components: schemas: native__PublicError: type: object properties: error: type: object properties: type: type: string enum: - invalid_request_error - authentication_error - permission_error - conflict_error - rate_limit_error - api_error - upstream_error description: |- Type discriminator for this object. **Allowed values** | Value | Meaning | | --- | --- | | `invalid_request_error` | Invalid request error. | | `authentication_error` | Authentication error. | | `permission_error` | Permission error. | | `conflict_error` | Conflict error. | | `rate_limit_error` | Rate limit error. | | `api_error` | Api error. | | `upstream_error` | Upstream error. | code: type: string enum: - invalid_parameter - invalid_credential - entitlement_required - method_not_allowed - permission_denied - missing_scope - resource_not_found - media_fetch_failed - resource_gone - state_conflict - rate_limit_exceeded - internal_error - operation_not_supported - upstream_failure - service_unavailable - credential_verification_unavailable - session_not_ready - command_dispatch_failed - result_unknown description: >- Stable machine-readable code for this result. **Allowed values** | Value | Meaning | | --- | --- | | `invalid_parameter` | Invalid parameter. | | `invalid_credential` | Invalid credential. | | `entitlement_required` | Entitlement required. | | `method_not_allowed` | Method not allowed. | | `permission_denied` | Permission denied. | | `missing_scope` | Missing scope. | | `resource_not_found` | Resource not found. | | `media_fetch_failed` | Media fetch failed. | | `resource_gone` | Resource gone. | | `state_conflict` | State conflict. | | `rate_limit_exceeded` | Rate limit exceeded. | | `internal_error` | Internal error. | | `operation_not_supported` | Operation not supported. | | `upstream_failure` | Upstream failure. | | `service_unavailable` | Service unavailable. | | `credential_verification_unavailable` | Credential verification unavailable. | | `session_not_ready` | Session not ready. | | `command_dispatch_failed` | Command dispatch failed. | | `result_unknown` | Result unknown. | message: type: string description: Human-readable message associated with this result. param: type: string nullable: true description: |- Specifies param for this error. **Accepted alternatives** | Alternative | Accepted input | | --- | --- | | Alternative 1 | Type: `string` | | Alternative 2 | `null` | required: - type - code - message - param description: Error details returned when the operation fails. data: type: string nullable: true enum: - null description: |- Always null for a failed request. **Allowed values** | Value | Meaning | | --- | --- | | `null` | Null. | **Accepted alternatives** | Alternative | Accepted input | | --- | --- | | Alternative 1 | Type: `string` | | Alternative 2 | `null` | docs: type: string format: uri description: |- Specifies docs for this native public error. **Value constraints** | Constraint | Accepted input | | --- | --- | | Format | `uri` | required: - error - data - docs securitySchemes: native__BearerAuth: type: http scheme: bearer description: >- Polymorfa organization key (pmfa_ prefix), project token (pmfa_pt_ prefix) where supported, or short-lived client token (pmfa_ct_ prefix). Organization and project keys may be personal or service-account owned and enforce selected action scopes. Organization keys cover the team and its projects; project tokens stay inside one project. Client tokens stay inside their live project and session and enforce their client rules. ````