Zoho Books must be integrated with Zoho CRM using Accounts and Contacts sync or using Accounts only sync to import a customer from CRM with its CRM account ID.
Note: You can get a contact by CRM account ID by using this <a href=/books/api/v3/contacts/#list-contacts/zcrm_account_id>API Endpoint
Authorization: Bearer ********************ZohoBooks.contacts.CREATE-Create Contactscurl --location --request POST '/crm/account//import'{
"code": 0,
"message": "success",
"data": {
"contact_id": 460000000026049
}
}