i am trying to merge a custom template and a base64 encoded pdf into one and send for signing. my current request body looks like tghis 

{

  "emailSubject": "Please sign this document",

  "compositeTemplates": p

    {

      "compositeTemplateId": "1",

      "serverTemplates": Â

        {

          "sequence": "1",

          "templateId": "" 

        }

      ],

      "inlineTemplates": <

        {

          "sequence": "2",

          "recipients": {

            "signers": Â

              {

                "email": "",

                "name": "M",

                "recipientId": "1",

                "routingOrder": "1",

                "roleName": "Signer",

                "tabs": {

                  "textTabs": Â

                    {

                      "tabLabel": "Agent1",

                      "value": "kaala1"

                    },

                    {

                      "tabLabel": "agent2",

                      "value": "kaala2"

                    },

                    {

                      "tabLabel": "agent3",

                      "value": "kaala3"

                    },

                    {

                      "tabLabel": "agent_npn",

                      "value": "1234567"

                    }

                  ],

                  "signHereTabs": l

                    {

                      "tabLabel": "Signature",

                      "anchorString": "/sig/",

                      "anchorXOffset": "0",

                      "anchorYOffset": "0",

                      "required": true,

                      "width": "200",

                      "height": "50"

                    }

                  ],

                  "dateSignedTabs":  

                    {

                      "tabLabel": "Date Signed",

                      "anchorString": "/date/",

                      "anchorXOffset": "0",

                      "anchorYOffset": "0",

                      "required": true

                    }

                  ]

                }

              }

            ]

          }

        }

      ],

      "documents": Â

        {

          "documentId": "1",

          "documentBase64": "", 

          "name": "Custom PDF Document",

          "fileExtension": "pdf"

        }

      ],

      "mergeProperties": true,

      "mergePdf": true 

    }

  ],

  "status": "sent"

}