# FAQs
<a name="faqs"></a>

 Use these common questions and answers to assist in the custom integration. 

**Topics**
+ [General FAQ](general-faq.md)
+ [Technical FAQ—fields](technical-faq-fields.md)
+ [Technical FAQ—Amazon S3](technical-faq-s3.md)
+ [Technical FAQ—leads and opportunities](technical-faq-leads-and-opps.md)
+ [Technical FAQ—versioning and backward compatibility](technical-faq-versioning.md)