about validate whether the sender drag one or more signatures for every signer

Hello Ideas team,

We advice all of our customer migrate to new send view as this document told:

https://www.docusign.com/blog/developers/esignature-rest-api-embedded-correct-view-updated?msockid=13eac2ad5d496fc10dc3d62c5c416ee9

and also can find the document:

https://developers.docusign.com/docs/esign-rest-api/reference/envelopes/envelopeviews/createsender/

we find the setting as below:

{
    "returnUrl": "<url>", // URL required
    "viewAccess": "envelope", // required  
    "settings": {
        "startingScreen": "Prepare", // (default) or "Tagger"
        "sendButtonAction": "send", // (default), "redirect"
        "showBackButton": "true", // (default), "false"
        "backButtonAction": "previousPage", // (default), "redirect"
        "showHeaderActions": "true", // (default), "false"
        "showDiscardAction": "true", // (default), "false"
        "lockToken": token_value,
        "recipientSettings": {        
            "showEditRecipients": "true", // (default), "false"
            "showContactsList": "true" // (default), "false"
        },
        "documentSettings": {  
            "showEditDocuments": "true", // (def,ault), "false"
            "showEditDocumentVisibility": "true" // (default), "false"
            "showEditPages": "true", // (default), "false"
        },
        "taggerSettings": {  
            "paletteSections": "default", // (default), "none", "custom"
            "paletteDefault": "custom" // "merge", "notary", "seals",
                              // "smartContracts", "annotations",
                              // "smartSections"
            }
        }
    }
}

Now the customer want add validate parameter for send button. We can define paramter for signature in the setting, so it will check whether the sender have drag signture for every signer before send. sometime the sender forget drag signature for other signer except the first one. if the sender not drag, will throw the error that he need to drag the signature for which signer. 

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