Zoho Subscriptions API Create Customer requires payment_terms?

This morning (9th Feb 2017) we found that all our calls to create customers using the Zoho Subscriptions API "Create a customer" call started failing, in our call we only provide the 2 required arguments "display_name" & "email", but today we are getting a response of code:4 "Invalid value passed for payment_terms" our calls work again once we provide a value for this argument.

Is payment_terms now a required field or is this a bug introduced since yesterday?

Example call:

curl https://subscriptions.zoho.com/api/v1/customers -H "Content-Type: application/json;charset=UTF-8" -H "X-com-zoho-subscriptions-organizationid: #########" -H "Authorization: Zoho-authtoken ################################" -d "{ 'display_name': 'Bowman Furniture', 'email': ' benjamin.george@bowmanfurniture.com' }"

Response:

{"code":4,"message":"Invalid value passed for payment_terms"}