ReferenceGlossaryAPIEntityOn this pageEntity Definition An Entity represents a business unit using Purse API. Each merchant or organization interacting with the platform is represented by at least one Entity, which acts as a logical container for configurations, transactions, and authentications. Entities are essential for isolating data and behavior across different brands, countries, or business lines. infoThe concept of Entity is especially important in multi-tenant or international environments, where each sub-unit requires distinct rules, credentials, or settings. API Usage Many API calls are scoped to a specific entity_id. This means: Transactions are tied to the entity that initiated them. Configuration and behavior (e.g. currency, payment methods, plugins) may vary by entity. API keys or session tokens may be limited to a specific entity context. If you use multiple entities, make sure you include the correct entity_id in your requests or session initialization. warningMissing or invalid entity_id may result in authentication failures or unexpected behavior.