Currency information is stored in invoice post meta: Meta Key Description Data Type _invoice_currency Currency code selected for this invoice (e.g., EUR, GBP) String (ISO 4217 code) Option Name Description apmc_currencies JSON array of all configured currencies with codes, names, symbols, rates, positions, decimals apmc_default_currency Default currency code (usually USD) Meta Key Description Data Type _client_currency Preferred currency code for this client (e.g., EUR, GBP) String (ISO 4217 code) The plugin uses these AJAX handlers for currency management: Handler Function apmc_get_currencies Retrieve all configured currencies (admin/frontend) apmc_get_world_currencies Fetch global currency list from Portal API (requires Pro) apmc_save_currency Add or update a currency configuration