The Plaid client configuration failed to support case-insensitive dictionary keys, snake_case fallbacks, and keyword-arguments-based initialization. This prevented developers from using common Python patterns (such as passing snake_case keys or direct kwargs) without manual dictionary normalization.

[sin-strokes]

The Plaid client configuration failed to support case-insensitive dictionary keys, snake_case fallbacks, and keyword-arguments-based initialization. This prevented developers from using common Python patterns (such as passing snake_case keys or direct kwargs) without manual dictionary normalization.

Case-Insensitive Dictionary Normalization

• Implemented a custom CaseInsensitiveDict subclassing dict that normalizes string keys to lowercase and strips separators (_ and -), mapping keys like client_id, CLIENT_ID, and client-id transparently to clientId.
• Overrode dictionary methods (__getitem__, __setitem__, __delitem__, __contains__, get, pop, setdefault, update, copy) to maintain standard dictionary semantics under normalization.
• Simplified get_api_key_with_prefix and auth_settings to leverage CaseInsensitiveDict directly, removing redundant iteration and manual casing fallback blocks.

Constructor Convenience & Property Setters

• Added support for direct keyword arguments (client_id, secret, plaid_version, environment) to the Configuration constructor, mapping them automatically into api_key and setting host from environment.
• Wrapped api_key and api_key_prefix with property setters to automatically cast standard dictionaries into CaseInsensitiveDict wrappers.

Code Generator Template Parity

• Replicated identical logic within the template file templates/python/configuration.mustache to ensure custom behaviors remain resilient across any future OpenAPI generator rebuilds.

Example Usage

import plaid

# Initialization using direct keyword arguments and environment aliases
configuration = plaid.Configuration(
    client_id="your-client-id",
    secret="your-secret",
    plaid_version="2020-09-14",
    environment="sandbox"
)

# Case and separator-insensitive key access
assert configuration.api_key['clientId'] == "your-client-id"
assert configuration.api_key['client_id'] == "your-client-id"

# In-place mutations are automatically normalized
configuration.api_key['CLIENT_ID'] = "new-client-id"
assert configuration.get_api_key_with_prefix('clientId') == "new-client-id"

Originally posted by @Copilot in sin-strokes#1