Update existing customer account information. If you update a customer's email address, FastSpring will apply the change to all active subscriptions in the customer's account. However, past orders and rebills will remain associated with their original email address.

{ 
   "contact":{ 
      "first":"String",
      "last":"String",
      "email":"String",
      "company":"String",      
      "phone":"String"        
   },
   "language":"en",             //ISO valid language code
   "country":"US",              //ISO valid country code
   "lookup":{                    
      "custom":"customKey"      //a-zA-Z0-9_- String with length bigger than or equals to 4
   }
}
Language
Authentication
Basic
base64
:
Click Try It! to start a request and see the response here!