Generate voucher for next purchase for specific group of customers

Hello Milos,
I have question related to your plugin to give a voucher for next purchase 

- is it possibile to define the coupon for a group of user in website? We have different rules for different group of user

- is it possible to define different coupon rules such as 10% for order upper than 100€ 15% for order upper than 200€? Expected behavior should be to receive coupon mail related ( if someone spend 200€ I expect it receive only the 15% coupon ) 

Hello,
As a main developer of the modules on mypresta.eu and also main developer of the "rewards - vouchers after orders" module i am responsible for this ticket now :-)
Regarding to your questions:

is it possibile to define the coupon for a group of user in website? We have different rules for different group of user

Module has two settings where you can configure group of customers. These settings are located in settings of "rewards instances" and in settings of "voucher code": 

• Reward settings
  Each instance of "reward" that module generates can for users can be applicable only for selected groups of customers: 
  
  
  
   
  So if you will select here - let's say - "customers" group - this means that this reward can be generated only for groups of customers associated with "customers" groups.
  
  
• Voucher code settings
  If customer will get this reward - this means that module will generate an unique voucher code for this user.
  Voucher code for each reward can have own unique settings where you can setup voucher value, conditions, actions. IN conditions section you can select groups of customers: 
  
  
  This option decides what kind of user will have possibility to use voucher code in cart. If customer will be associated with selected groups of customers - it will have possibility to use the voucher code during checkout
  
  
  

- is it possible to define different coupon rules such as 10% for order upper than 100€ 15% for order upper than 200€? Expected behavior should be to receive coupon mail related ( if someone spend 200€ I expect it receive only the 15% coupon ) 

Of course this is possible. As i already mentioned in my previous answer - module has a section where you can configure "reward settings". These settings defines conditions that are required to receive a reward.
So, you can setup there expected conditions like "give this reward if order value will be higher than €100 but not higher than €200" as on screenshot: 



in addition to this there are much more conditions, thanks to this you can control who and when exactly will receive a reward :)

if there are some other questions - feel free to write. 

best regards

milos