title: NEO N3 Blockchain - Structuring fees for multi-contract transactions
body: <p>I'm learning NEO blockchain programming with Python
  and I've started working on a modular project where different parts are executed by different smart contracts hard-linked back together.</p>
  <p>I want to have a functionality such as:
  send 1 NEO to contract A -&gt; contract A mints 1 XXX Token and sends it to cotnract B -&gt;
  contract B does some operations or locks the funds for a bit then allows the user to reclaim it</p>
  <p>It's purely theoretical simplified example to illustrate my question.
  How in such case transaction fees would be paid? If I want a contract to call to another contract, will the contract have to pay the fees for this transaction?</p>