Install PHP script and library and add field to form

Taxnumber-Field check - PHP script / Library are ready We need to check if a tax number is valid or not. Its mainly a script installation, because its "ready to use". Steps: 1. Rename TAXNUMBER in form to "USt-IdNr" 2. Under field as "example DE123456789 - only for members of the european union (EU)" 3. Make sure hat the script checks if the Tax ID is valid and if the name is the company name is the same entered in form. If tax ID is not valid or name is wrong to tax ID, the field tax has to be saved emty in database. In case there is something wrong, we need a message, like "Your Tax ID is not valid" Button > "OK" - "Back" We send you a link for libary and PHP-script. !!! conflict free (must be full working) !!! Don't bid if you can't start immediately. !!! No payments if the job is not done. !!! You have to work online on server. !!! We have a budget of 50$ for this task. !!! The job has to be done fast