Hi All,

I have a apex code to connect a third party API,

public with sharing class Saltedgelead 
{
    
      @InvocableMethod(label='leadsession' description='Create salt edge lead session')
    public static void leadtest()
        {
            Saltedgelead.geturl();
        }
    public static void geturl()
    { 
        String uri;
            Http http = new Http();
            HttpRequest request = new HttpRequest();
            request.setEndpoint('https://www.saltedge.com/api/partners/v1/lead_sessions/create');
            request.setMethod('POST');
            request.setHeader('Accept','application/json');
            request.setHeader('Content-Type', 'application/json');
            request.setHeader('App-id', 'q_-XTJ_zMjDdH3PiTTSY1q_SbhxYsdfgsg3SB1P3x_9-fJZh8');
            request.setHeader('Secret', 'iBUhgfhgfh6-5dIfUjT3gfNsGrznM-3WQ9ID8UJhMm-8ZsqLGE');
            request.setBody('{"data": {"customer_id": "2911634823132425819231","provider_code": "fake_oauth_client_xf","consent": {"scopes": ["account_details", "transactions_details"]}}}');
            HttpResponse responseg = http.send(request);  
            
         if (responseg.getStatusCode() != 201) {
            System.debug('The status code returned was not expected: ' +
            responseg.getStatusCode() + ' ' + responseg.getStatus());
             System.debug(responseg.getBody()); 
              String urli = responseg.getBody();
            Saltedgelead.sendingEmail(urli);
        } 
        else {
            Map<String, Object> results = (Map<String, Object>) JSON.deserializeUntyped(responseg.getBody());
            uri = (string) results.get('token');
        }
        // return responseg.toString();
           
        //Get
         Http httpg = new Http();
        HttpRequest requestg = new HttpRequest();
       requestg.setEndpoint('https://www.saltedge.com/api/partners/v1/customers/291163482315345819231');
        requestg.setMethod('GET');
        requestg.setHeader('Accept','application/json');
        requestg.setHeader('Content-Type', 'application/json');
       requestg.setHeader('App-id', 'q_-XTJ_zMjDdH3PiTTSY1q_SbhxY3SdsgB1P3x_9-fJZh8');
     requestg.setHeader('Secret', 'iBUdsfgg6-5dIfUjT3gfNsGrznM-3WQ9ID8UJhMm-8ZsqLGE');
       // requestg.setHeader('X-Fern-Token', uri);
        HttpResponse res = http.send(requestg);

        if (res.getStatusCode() != 200) {
            System.debug('The status code returned was not expected: ' +
            res.getStatusCode() + ' ' + res.getStatus());
        } else {
            System.debug(res.getBody());
        }   
    }
     public static void sendingEmail(String email) {
        Messaging.SingleEmailMessage semail = new Messaging.SingleEmailMessage();
        String[] sendingTo = new String[]{'xxxxxxxx@gmail.com'};
        semail.setToAddresses(sendingTo);
        String[] sendingToBccAdd = new String[]{'xxxxxxxxxx@fernsoftware.com'};
        semail.setBccAddresses(sendingToBccAdd);
        String[] sendingTocAdd = new String[]{'xxxxxxxxxxx@gmail.com'};
        semail.setCcAddresses(sendingTocAdd);
        semail.setSubject('Single Email message Example');
        semail.setPlainTextBody(email);
        Messaging.sendEmail(new Messaging.SingleEmailMessage[] {semail});
        //return null;
    }
}

Now I'm invoke this apex class in process builder to send the apex output data as a single mail to the user.

When my process builder start runs I get an error like - 
"We can't save this record because the “Saltedge API” process failed. Give your Salesforce admin these details. An Apex error occurred: System.CalloutException: You have uncommitted work pending. Please commit or rollback before calling out Error ID: 208143754-77391 (-1742348029"

Is I need to change my code? 
Any idea. 

Thanks all.