New VT-WEB suppot
Tidy up a bit
add installment_terms
veritrans_notification receive json from 'php://input' as default
Merge pull request #8 from veritrans/new_vtweb

New vtweb
Update README.md

auto construct using php://input
Merge pull request #7 from mul14/master

Remove E_STRICT when call HashGenerator::generate()