Adding Subscription to an Existing Customer - Subscriptions API

Adding Subscription to an Existing Customer - Subscriptions API

Good day,

Please I am trying to add subscription to an exiting customer, so I send the customer ID along with other request parameters. but I get the error message "The Customer field can neither be blank nor be incorrect. Please enter a correct customer."
I don't have the customer field because its an existing customer. So how do I work around this issue?

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