aho_sdk Python SDK

Official Python SDK for the Aho Verifiable Credentials API.

Installation

# Basic installation (sync only)
pip install aho-sdk

# With async support
pip install aho-sdk[async]

# With validation (Pydantic models)
pip install aho-sdk[validation]

# All features
pip install aho-sdk[all]

Quick Start

import os
from aho_sdk import Issuer

# Initialize the Issuer client
issuer = Issuer(api_key=os.environ['AHO_ISSUER_API_KEY'])

# Issue a credential
credential = issuer.credentials.create(
    schema_uuid='your-schema-uuid',
    subject_identifier='user@example.com',
    claims={
        'name': 'Jane Doe',
        'role': 'Engineer'
    }
)

print(credential['uuid'])

Clients

The SDK provides the following clients:

Client	Purpose	API Key Type
Account	Manage account settings, domains, and API keys	Account API Key
System	System health and status endpoints	System API Key
Holder	Manage holder credentials and presentations	Holder API Key
Verifier	Create presentation requests and verify credentials	Verifier API Key
Issuer	Issue and manage verifiable credentials	Issuer API Key
Schemas	Browse and retrieve credential schemas	Schemas API Key
Unauthenticated	Public endpoints (no authentication required)	None (public)

Usage Examples

Issuing Credentials

from aho_sdk import Issuer

issuer = Issuer(api_key=os.environ['AHO_ISSUER_API_KEY'])

# List all schemas
schemas = issuer.schemas.list()
for schema in schemas:
    print(schema['name'])

# Create a schema
schema = issuer.schemas.create(
    name='EmployeeBadge',
    claims=[
        {'name': 'employee_id', 'type': 'string', 'required': True},
        {'name': 'department', 'type': 'string', 'required': True},
        {'name': 'hire_date', 'type': 'date', 'required': False}
    ]
)

# Issue a credential
credential = issuer.credentials.create(
    schema_uuid=schema['uuid'],
    subject_identifier='jane.doe@company.com',
    claims={
        'employee_id': 'EMP-12345',
        'department': 'Engineering',
        'hire_date': '2024-01-15'
    }
)

# Revoke a credential
issuer.credentials.revoke(uuid=credential['uuid'], reason='Employee departed')

Verifying Credentials

from aho_sdk import Verifier

verifier = Verifier(api_key=os.environ['AHO_VERIFIER_API_KEY'])

# Create a presentation request
request = verifier.requests.create(
    name='Employment Verification',
    query_format='dcql',
    credentials=[
        {
            'id': 'employee_badge',
            'format': 'vc+sd-jwt',
            'claims': [
                {'path': ['employee_id']},
                {'path': ['department']}
            ]
        }
    ]
)

# Get the QR code for the request (supports 'png', 'svg' formats)
qr = verifier.requests.qr_code(uuid=request['uuid'], output_format='svg')

# List responses to the request
responses = verifier.responses.list(request_uuid=request['uuid'])

Managing Holder Credentials

from aho_sdk import Holder

holder = Holder(api_key=os.environ['AHO_HOLDER_API_KEY'])

# List credentials
credentials = holder.credentials.list(status='active')

# Create a presentation (selective disclosure)
presentation = holder.presentations.create(
    credential_uuid='credential-uuid',
    disclosed_claims=['name', 'department']
)

Account Management

from aho_sdk import Account

account = Account(api_key=os.environ['AHO_API_KEY'])

# Manage domains
domains = account.domains.list()
account.domains.verify(id=domain['id'])

# Manage signing keys
keys = account.signing_keys.list()
account.signing_keys.rotate(id=key['id'])

# Configure webhooks
account.webhooks.create(
    url='https://your-app.com/webhooks/aho',
    events=['credential.issued', 'credential.revoked']
)

Pagination

List methods return Page objects with built-in iteration:

# Iterate through all pages automatically
for credential in issuer.credentials.list():
    print(credential['uuid'])

# Or handle pages manually
page = issuer.credentials.list(per_page=50)
while page:
    for credential in page.data:
        print(credential['uuid'])
    page = page.next_page()

# Collect all items
all_credentials = list(issuer.credentials.list())

File Uploads

For endpoints that accept file uploads:

# Upload a file
issuer.media.upload(
    file=open('document.pdf', 'rb'),
    metadata={'description': 'Employee contract'}
)

# The SDK auto-detects MIME types from file extensions
# You can also pass a Path:
from pathlib import Path
issuer.media.upload(file=Path('document.pdf'))

Binary Responses

Some endpoints return binary data (images, PDFs):

# Get QR code as PNG
png_data = verifier.requests.qr_code(uuid='...', output_format='png')
with open('qr.png', 'wb') as f:
    f.write(png_data)

# Get QR code as SVG
svg_data = verifier.requests.qr_code(uuid='...', output_format='svg')
with open('qr.svg', 'w') as f:
    f.write(svg_data.decode('utf-8'))

Error Handling

from aho_sdk import (
    Issuer,
    ValidationError,
    AuthenticationError,
    NotFoundError,
    RateLimitError,
    ApiError
)

try:
    issuer.credentials.create(invalid_params)
except ValidationError as e:
    # 422 - Validation failed
    for error in e.field_errors:
        print(f"{error['field']}: {error['hint']}")
except AuthenticationError as e:
    # 401 - Invalid API key
    print("Check your API key")
except NotFoundError as e:
    # 404 - Resource not found
    print(f"Resource not found: {e.message}")
except RateLimitError as e:
    # 429 - Rate limited (SDK auto-retries with exponential backoff)
    print(f"Retry after {e.retry_after} seconds")
except ApiError as e:
    # Other API errors
    print(f"Error {e.status_code}: {e.message}")
    print(f"Request ID: {e.request_id}")

Error Classes

Error Class	HTTP Status	Description
AuthenticationError	401	Invalid or missing API key
ForbiddenError	403	Insufficient permissions
NotFoundError	404	Resource not found
ConflictError	409	Resource conflict
ValidationError	422	Request validation failed
RateLimitError	429	Rate limit exceeded
ServerError	5xx	Server-side error
NetworkError	-	Connection/timeout error
ApiError	*	Base class for all API errors

Rate Limiting

The SDK automatically handles rate limits with exponential backoff:

• Idempotent methods (GET, DELETE, PUT): Auto-retry up to 3 times
• Non-idempotent methods (POST, PATCH): Only retry with idempotency key

# Use idempotency keys for safe retries on POST/PATCH
issuer.credentials.create(
    schema_uuid='...',
    claims={...},
    idempotency_key='unique-request-id'
)

Configuration

import logging

# Custom configuration
issuer = Issuer(
    api_key=os.environ['AHO_ISSUER_API_KEY'],
    base_url='https://api.aho.com',  # Custom base URL
    timeout=60,                       # Request timeout in seconds
    logger=logging.getLogger('aho')   # Enable debug logging
)

Async Support

The SDK provides async versions of all clients. Install with async support:

pip install aho-sdk[async]

Then use the async clients:

import asyncio
from aho_sdk import AsyncIssuer

async def main():
    # Use async context manager for automatic cleanup
    async with AsyncIssuer(api_key=os.environ['AHO_ISSUER_API_KEY']) as issuer:
        # All methods are async
        credentials = await issuer.credentials.list()

        # Async iteration through pages
        async for credential in credentials:
            print(credential['uuid'])

        # Or await individual operations
        credential = await issuer.credentials.get(uuid='...')

asyncio.run(main())

Async clients available:

• AsyncAccount - Async version of Account
• AsyncSystem - Async version of System
• AsyncHolder - Async version of Holder
• AsyncVerifier - Async version of Verifier
• AsyncIssuer - Async version of Issuer
• AsyncSchemas - Async version of Schemas
• AsyncUnauthenticated - Async version of Unauthenticated

Requirements

• Python 3.9+
• httpx (for async support, optional)

License

MIT