Correction in composer.json (doesn't need more than php5.4)
Correction in composer.json (doesn't need more than php5.4)

Composer refuses to install this SDK when php5.5 isn't available, but it doesn't use any of php5.5's new features and it perfectly works on 5.4
andufratu/mangopay2-php-sdk,andufratu/mangopay2-php-sdk,Mangopay/mangopay2-php-sdk,Mangopay/mangopay2-php-sdk