Guys, it is not at all normal to pay 5000EU before you even see a contract!
Seriously?? I understand the desperation to get into the right seat of a 737/320, believe me, I have been there
But giving 5000EU away in such a manner is disrespecting your own self. Think about it, if you operated a legitimate trustworthy business - would you make such a demand of your client? You know the answer!
Run a million miles.