Need a Developer to customize Mailwizz

Hi

1. We want to implement a calculator in mailwizz where a customer can mention the email volume he requires and the price is calculated. Then this price is charged via paypla and the email credits are added to the customer account. (pretty much like mandrill pricing calculator)

2. We want to generate a universal DKIM and SPF key for all the domains to verify.

3. We want to remove the server options from customer area so that customer cannot see, add or manage the servers. Instead we want to send all the emails for all the customers via all the smtp servers that we will mention.
 
I want a developer who can customize pricing for my website. Can team here please share the details of a developer who can help me customize the maiwizz pricing based on contacts, subscription, volume
 
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