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    Wait List API
    Use the Wait List API to collect customer's email address.
    PUT
    /v1/forms/{form-id}
    Request Body
    Type Description Format
    Email string Email address of the customer.
    A successful request returns HTTP 200 with an empty object in the JSON response body. 
                            
    curl -X PUT https://api.stack.promo/v1/forms/30c370052b934f70812ef52837b0d353 \
    -H 'Content-Type: application/json' \
    -H 'Referer: https://stack.promo' \
    -d '{            
            "email": "john@stack.promo"
        }'