SampleAuraController.js Lightning Component

SampleAuraController.js

({
  'showAccount' : function(cmp, ev, helper) {
    var params = { accountId : '001xxxxxxxxxxxx' }; // your parameters
    helper.sendRequest(cmp, 'c.firstRequest', params)
    .then($A.getCallback(function(records) {
      console.log('First From Server-Side: ' + records);
      return helper.sendRequest(cmp, 'c.secondRequest', params);
    }))
    .then($A.getCallback(function(records) {
      console.log('Second From Server-Side: ' + records);
    }))
    .catch(function(errors) {
      console.error('ERROR: ' + errors);
    });
  }
  
})