Contacts

The CRM Contacts APIs encompass a group of APIs designed to facilitate the management of multiple contacts in a single request. This set of APIs consists of three primary components: Get, Upsert, and Delete APIs.
These CRM Contacts APIs can retrieve both standard and dynamic fields. Standard fields will be presented with readable names, such as 'firstName,' 'lastName,' 'email,' and so on. On the other hand, dynamic fields will be displayed with key names, such as 'custom_xxxx,' and so forth.
To gain a better understanding of what dynamic fields are, you can reference the 'Get Contact Field Definition' API, which provides access to all field definitions. You can then compare these definitions with the 'fieldName' field to distinguish dynamic fields.