Implement AES-256-CBC encryption for PHP 7.0+

- Add support for AES-256-CBC encryption for PHP 7.0+ with OpenSSL > 1.0.0
- Maintain backward compatibility with RC4 for older PHP versions
- Add IV parameter handling for AES encryption
- Update payment form generation to include IV parameter when using AES
- Add comprehensive tests for AES encryption and form generation
- Fix 500 error when processing payments with newer PHP versions

Author: aflorea4

.phpunit.cache/test-results

@@ -1 +1 @@
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composer.json

@@ -14,7 +14,8 @@
         "illuminate/support": "^8.0|^9.0|^10.0",
         "ext-openssl": "*",
         "ext-dom": "*",
-        "felixdorn/php-rc4": "^0.1.0"
+        "felixdorn/php-rc4": "^0.1.0",
+        "guzzlehttp/guzzle": "^7.9"
     },
     "require-dev": {
         "orchestra/testbench": "^6.0|^7.0|^8.0",