send method Null safety

Future<Response> send(
  1. List<AirtimeRecipient> recipients
)

Sends Airtime

Requires recipients a list of AirtimeRecipient, which os just (recipient phone number, amount, currency)

Implementation

Future<http.Response> send(
  List<AirtimeRecipient> recipients
)async{
  return await africasTalking.httpPostProcess(
    africasTalking.isLive ? airtimeLiveUrl : airtimeTestUrl,
    {
      'recipients': json.encode(recipients.map((e) => e.asMap()).toList())
    }
  );

}