Retrieves a customer by their external ID. The external ID is the ID provided by the merchant system.
API key for authentication (required)
Merchant ID for identifying the merchant (required)
External customer ID
Customer details retrieved successfully
External customer ID from merchant system
"CUST-123"
Customer's first name
"John"
Customer's last name
"Doe"
Customer's email address
Customer's phone number
"+1234567890"
Whether the customer is active
true
Customer notification preferences
Customer creation timestamp
"2024-03-20T10:00:00Z"
Customer last update timestamp
"2024-03-20T10:00:00Z"