Verra API Integration Specification — Data Exchange Protocol

Overview

This document outlines the technical specifications for the integration of DaedArch Corporation’s sensor-based Monitoring, Reporting, and Verification (MRV) platform with the Verra systems. The purpose of this integration is to facilitate the exchange of verified environmental data and carbon offset metrics in compliance with the Verified Carbon Standard (VCS). The integration shall ensure adherence to rigorous Measurement, Reporting, and Verification (MRV) protocols and support both technology-based and nature-based solutions.

Authentication

1. Authentication Mechanism

The Verra API employs OAuth 2.0 for secure authentication. DaedArch Corporation shall implement the following steps to obtain an access token:

1. Client Registration: DaedArch must register as a client with Verra to receive a `client_id` and `client_secret`.
2. Token Request:

• Endpoint: POST https://api.verra.org/oauth/token
• Headers:
• Content-Type: application/x-www-form-urlencoded
• Body:

`plaintext grant_type=client_credentials&client_id={client_id}&client_secret={client_secret} `

1. Access Token: Upon successful authentication, the response shall include an access token, which will be used for subsequent API calls.

2. Token Expiry and Refresh

Access tokens are valid for 1 hour. DaedArch shall implement logic to refresh tokens using the same endpoint and parameters as above, prior to the expiration of the current token.

Endpoints

1. Data Submission Endpoint

a. Endpoint URL

• POST https://api.verra.org/v1/offsets

b. Request Headers

• Authorization: Bearer {access_token}
• Content-Type: application/json

c. Request Body

The request body must adhere to the following JSON schema:

`json { "projectId": "string", "offsets": [ { "offsetId": "string", "amount": "number", "timestamp": "string (ISO 8601 format)", "source": { "type": "string (either 'technology' or 'nature')", "details": { "sensorId": "string", "location": { "latitude": "number", "longitude": "number" } } }, "verificationStatus": "string (either 'pending', 'verified', or 'rejected')" } ] } `

d. Response

Upon successful submission, the API shall return a 201 Created status with the following JSON response:

`json { "message": "Offsets submitted successfully.", "submittedAt": "string (ISO 8601 format)", "offsetIds": ["string"] } `

2. Data Retrieval Endpoint

a. Endpoint URL

• GET https://api.verra.org/v1/offsets/{projectId}

b. Request Headers

• Authorization: Bearer {access_token}

c. Response

The response shall return the following structure:

`json { "projectId": "string", "offsets": [ { "offsetId": "string", "amount": "number", "timestamp": "string (ISO 8601 format)", "source": { "type": "string", "details": { "sensorId": "string", "location": { "latitude": "number", "longitude": "number" } } }, "verificationStatus": "string" } ] } `

3. Verification Status Update Endpoint

a. Endpoint URL

• PATCH https://api.verra.org/v1/offsets/{offsetId}

b. Request Headers

• Authorization: Bearer {access_token}
• Content-Type: application/json

c. Request Body

`json { "verificationStatus": "string (either 'verified' or 'rejected')", "comments": "string (optional)" } `

d. Response

A successful update shall return a 200 OK status with the following JSON response:

`json { "message": "Verification status updated successfully.", "offsetId": "string", "newStatus": "string" } `

Data Models

1. Project Data Model

The project data model must include the following fields:

| Field Name | Data Type | Description | |------------------|-----------|--------------------------------------------------| | projectId | string | Unique identifier for the project | | name | string | Name of the project | | description | string | Description of the project | | createdAt | string | ISO 8601 format timestamp of project creation | | updatedAt | string | ISO 8601 format timestamp of last update |

2. Offset Data Model

The offset data model must include the following fields:

| Field Name | Data Type | Description | |------------------|-----------|--------------------------------------------------| | offsetId | string | Unique identifier for the offset | | amount | number | Amount of carbon offsets in metric tons | | timestamp | string | ISO 8601 format timestamp of the measurement | | source | object | Details of the source of the offset | | verificationStatus| string | Current status of verification |

3. Source Data Model

The source data model must include the following fields:

| Field Name | Data Type | Description | |------------------|-----------|--------------------------------------------------| | type | string | Type of the source ('technology' or 'nature') | | details | object | Details specific to the source |

4. Location Data Model

The location data model must include the following fields:

| Field Name | Data Type | Description | |------------------|-----------|--------------------------------------------------| | latitude | number | Latitude of the sensor location | | longitude | number | Longitude of the sensor location |

Error Handling

1. Error Response Format

In the event of an error, the API shall return a JSON object with the following structure:

`json { "error": { "code": "string", "message": "string", "details": "string (optional)" } } `

2. Common Error Codes

| Error Code | HTTP Status | Description | |------------------|-------------|--------------------------------------------------| | INVALID_REQUEST | 400 | The request is malformed or contains invalid data| | UNAUTHORIZED | 401 | Authentication failed or invalid token | | FORBIDDEN | 403 | Access to the resource is forbidden | | NOT_FOUND | 404 | Resource was not found | | INTERNAL_ERROR | 500 | An internal server error occurred |

Rate Limits

1. Rate Limiting Policy

Verra enforces a rate limit of 100 requests per minute per client. DaedArch shall implement logic to handle rate limiting, including:

1. Response Headers: The API shall return rate limit information in headers:

• X-RateLimit-Limit: The maximum number of requests allowed in the current window.
• X-RateLimit-Remaining: The number of requests remaining in the current window.
• X-RateLimit-Reset: The time when the rate limit will reset (in epoch seconds).

1. Handling Rate Limit Exceeded: If the rate limit is exceeded, the API shall return a 429 Too Many Requests status with an error response indicating the limit has been reached.

2. Best Practices

DaedArch shall implement exponential backoff strategies for retrying requests that fail due to rate limiting. The maximum backoff time should not exceed 60 seconds.

Compliance and Verification Procedures

1. Data Integrity Checks

DaedArch shall implement data integrity checks to ensure that all submitted data is accurate and verifiable. This includes:

• Checksum Validation: A checksum algorithm (e.g., SHA-256) shall be applied to each data submission to verify data integrity during transmission.
• Audit Trails: All data submissions shall be logged with timestamps, user IDs, and status updates to maintain a full chain-of-custody audit trail.

2. Third-Party Verification

All data submitted to Verra must undergo third-party verification as per VCS requirements. DaedArch shall ensure that:

• Verification bodies are accredited by Verra.
• Verification reports are submitted via the designated API endpoint.
• Any discrepancies identified during verification are addressed promptly and resubmitted in compliance with Verra standards.

3. Regular Audits

DaedArch shall participate in regular audits conducted by Verra to assess compliance with VCS standards, including:

• Review of submitted data for accuracy and completeness.
• Assessment of the effectiveness of the MRV platform.
• Evaluation of the adherence to the established data exchange protocols.

Conclusion

This document serves as the comprehensive API integration specification for DaedArch Corporation's collaboration with Verra. Adherence to the outlined protocols, data models, and compliance procedures is mandatory to ensure the integrity and reliability of carbon offset data exchanged between the two entities. DaedArch shall maintain ongoing communication with Verra to address any updates to standards or protocols as they arise.