<span class="parameter-name">amount</span>, </span><span class="parameter" id="initiateTransaction-param-url"><span class="type-annotation"><a href="https://api.flutter.dev/flutter/dart-core/String-class.html">String</a>?</span> <span class="parameter-name">url</span>, </span><span class="parameter" id="initiateTransaction-param-transactionNote"><span class="type-annotation"><a href="https://api.flutter.dev/flutter/dart-core/String-class.html">String</a>?</span> <span class="parameter-name">transactionNote<