FSFPAY Payment Gateway - Updated

This plugin injects the FSFPAY payment widget directly under the shortcode form so it displays inline.
It attempts to fetch supported currencies and cryptocurrencies from FSFPAY API endpoints; if unavailable, it falls back to configured lists.

Shortcode:
[fsfpay amount="120" currency="USD" cryptocurrency="BTC" description="Donation" button_text="Pay Now"]

Installation:
1. Upload the folder 'fsfpay-for-wordpress-updated' to /wp-content/plugins/ or use the ZIP upload.
2. Activate the plugin.
3. Go to Admin -> FSFPAY and enter your API Key, API Username, API Secret, configure coins and callback URL.
4. Place the shortcode on a page/post and test.
