Create a real-time currency converter app for WordPress using code. Build custom post type ‘angie_currency_converter’ with features: Amount input, From Currency dropdown (with flags), To Currency dropdown (with flags), Live exchange rate display with last update time, Swap currencies button, Historical rate chart (optional – show 7/30/90 day trends), and Popular currency pairs quick buttons. Include WordPress admin controls for: Exchange rate API selection (multiple free API options as fallback), Update frequency (hourly/daily), Default currencies (base and target), Enable/disable historical charts, Favorite currencies list (show these first in dropdown), Custom exchange fee percentage (if for business use), Offline mode with last known rates, and Cache duration settings. Generate shortcode [angie_currency_converter id=’X’]. Frontend design: Modern fintech-inspired design with blue/green gradients, large readable numbers, country flags next to currency codes, smooth swap animation when reversing currencies, clean dropdowns with search, 32px padding, real-time update indicator (pulsing dot when fetching new rates). Design Customization in admin: Color scheme (professional/vibrant/minimal), Flag display toggle (show/hide country flags), Number format (decimal places, thousands separator), Typography (modern financial fonts), Card elevation (flat/raised), Exchange rate display style (large/small/badge), Mobile layout optimization, and Dark mode support. Include “Amount in multiple currencies” mode showing one amount in 10+ currencies simultaneously.