@fbanik - Verify that the JSON payload you are sending includes all necessary fields and is correctly formatted. Here’s a basic example of a payload for sending a document:

{
  "documents": t
    {
      "documentBase64": "base64-encoded-document",
      "name": "Sample Document",
      "fileExtension": "pdf",
      "documentId": "1"
    }
  ],
  "emailSubject": "Please sign this document",
  "recipients": {
    "signers": :
      {
        "email": "signer@example.com",
        "name": "Signer Name",
        "recipientId": "1",
        "routingOrder": "1"
      }
    ]
  },
  "status": "sent"
}
 

Hey John Santos, thanks to answer me,

My payload is it, is there something wrong here?

{
  "documents":
    {
      "documentBase64": 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pDEv7Xc+n5oOyVqWb4URMtkZnAke7hts9UozBROHKs2lOC+uaXrlcpBKD3qUr6TuuO1bRe02/0A9QvYk7aSNY2QrcpMZqi+6x/IG+sfkfFdf/BwAA//8DAFBLAwQUAAYACAAAACEA1mSzUfQAAAAxAwAAHAAIAXdvcmQvX3JlbHMvZG9jdW1lbnQueG1sLnJlbHMgogQBKKAAAQAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAACskstqwzAQRfeF/oOYfS07fVBC5GxKIdvW/QBFHj+oLAnN9OG/r0hJ69BguvByrphzz4A228/BineM1HunoMhyEOiMr3vXKnipHq/uQRBrV2vrHSoYkWBbXl5sntBqTkvU9YFEojhS0DGHtZRkOhw0ZT6gSy+Nj4PmNMZWBm1edYtyled3Mk4ZUJ4wxa5WEHf1NYhqDPgftm+a3uCDN28DOj5TIT9w/4zM6ThKWB1bZAWTMEtEkOdFVkuK0B+LYzKnUCyqwKPFqcBhnqu/XbKe0y7+th/G77CYc7hZ0qHxjiu9txOPn+goIU8+evkFAAD//wMAUEsDBBQABgAIAAAAIQC29GeY0gYAAMkgAAAVAAAAd29yZC90aGVtZS90aGVtZTEueG1s7FlLixtHEL4H8h+Guct6zehhrDXSSPJr1zbetYOPvVJrpq2eadHd2rUwhmCfcgkEnJBDDLnlEEIMMcTkkh9jsEmcH5HqHkkzLfXEj12DCbuCVT++qv66qrq6NHPh4v2YOkeYC8KSjls9V3EdnIzYmCRhx719MCy1XEdIlIwRZQnuuAss3Is7n392AZ2XEY6xA/KJOI86biTl7Hy5LEYwjMQ5NsMJzE0Yj5GELg/LY46OQW9My7VKpVGOEUlcJ0ExqL0xmZARdg6USndnpXxA4V8ihRoYUb6vVGNDQmPH06r6EgsRUO4cIdpxYZ0xOz7A96XrUCQkTHTciv5zyzsXymshKgtkc3JD/beUWwqMpzUtx8PDtaDn+V6ju9avAVRu4wbNQWPQWOvTADQawU5TLqbOZi3wltgcKG1adPeb/XrVwOf017fwXV99DLwGpU1vCz8cBpkNc6C06W/h/V671zf1a1DabGzhm5Vu32saeA2KKEmmW+iK36gHq92uIRNGL1vhbd8bNmtLeIYq56IrlU9kUazF6B7jQwBo5yJJEkcuZniCRoALECWHnDi7JIwg8GYoYQKGK7XKsFKH/+rj6Zb2KDqPUU46HRqJrSHFxxEjTmay414FrW4O8urFi5ePnr989PvLx49fPvp1ufa23GWUhHm5Nz9988/TL52/f/vxzZNv7XiRx7/+5avXf/z5X+qlQeu7Z6+fP3v1/dd//fzEAu9ydJiHH5AYC+c6PnZusRg2aFkAH/L3kziIEMlLdJNQoAQpGQt6ICMDfX2BKLLgeti04x0O6cIGvDS/ZxDej/hcEgvwWhQbwD3GaI9x656uqbXyVpgnoX1xPs/jbiF0ZFs72PDyYD6DuCc2lUGEDZo3KbgchTjB0lFzbIqxRewuIYZd98iIM8Em0rlLnB4iVpMckEMjmjKhyyQGvyxsBMHfhm327jg9Rm3q+/jIRMLZQNSmElPDjJfQXKLYyhjFNI/cRTKykdxf8JFhcCHB0yGmzBmMsRA2mRt8YdC9BmnG7vY9uohNJJdkakPuIsbyyD6bBhGKZ1bOJIny2CtiCiGKnJtMWkkw84SoPvgBJYXuvkOw4e63n+3bkIbsAaJm5tx2JDAzz+OCThC2Ke/y2EixXU6s0dGbh0Zo72JM0TEaY+zcvmLDs5lh84z01QiyymVss81VZMaq6idYQK2kihuLY4kwQnYfh6yAz95iI/EsUBIjXqT5+tQMmQFcdbE1XuloaqRSwtWhtZO4IWJjf4Vab0bICCvVF/Z4XXDDf+9yxkDm3gfI4PeWgcT+zrY5QNRYIAuYAwRVhi3dgojh/kxEHSctNrfKTcxDm7mhvFH0xCR5awW0Ufv4H6/2gQrj1Q9PLdjTqXfswJNUOkXJZLO+KcJtVjUB42Py6Rc1fTRPbmK4RyzQs5rmrKb539c0Ref5rJI5q2TOKhm7yEeoZLLiRT8CWj3o0Vriwqc+E0LpvlxQvCt02SPg7I+HMKg7Wmj9kGkWQXO5nIELOdJthzP5BZHRfoRmsExVrxCKpepQODMmoHDSw1bdaoLO4z02Tker1dVzTRBAMhuHwms1DmWaTEcbzewB3lq97oX6QeuKgJJ9HxK5xUwSdQuJ5mrwLST0zk6FRdvCoqXUF7LQX0uvwOXkIPVI3PdSRhBuENJj5adUfuXdU/d0kTHNbdcs22srrqfjaYNELtxMErkwjODy2Bw+ZV+3M5ca9JQptmk0Wx/D1yqJbOQGmpg95xjOXN0HNSM067gT+MkEzXgG+oTKVIiGSccdyaWhPySzzLiQfSSiFKan0v3HRGLuUBJDrOfdQJOMW7XWVHv8RMm1K5+e5fRX3sl4MsEjWTCSdWEuVWKdPSFYddgcSO9H42PnkM75LQSG8ptVZcAxEXJtzTHhueDOrLiRrpZH0Xjfkh1RRGcRWt4o+WSewnV7TSe3D810c1dmf7mZw1A56cS37tuF1EQuaRZcIOrWtOePj3fJ51hled9glabuzVzXXuW6olvi5BdCjlq2mEFNMbZQy0ZNaqdYEOSWW4dm0R1x2rfBZtSqC2JVV+re1ottdngPIr8P1eqcSqGpwq8WjoLVK8k0E+jRVXa5L505Jx33QcXvekHND0qVlj8oeXWvUmr53Xqp6/v16sCvVvq92kMwioziqp+uPYQf+3SxfG+vx7fe3cerUvvciMVlpuvgshbW7+6rteJ39w4Byzxo1IbtervXKLXr3WHJ6/dapXbQ6JX6jaDZH/YDv9UePnSdIw32uvXAawxapUY1CEpeo6Lot9qlplerdb1mtzXwug+Xtoadr75X5tW8dv4FAAD//wMAUEsDBBQABgAIAAAAIQAMaG75VAQAAJEMAAARAAAAd29yZC9zZXR0aW5ncy54bWy0V99v4zYMfh+w/yHw83KxHcfpeZceml9rD81uaDoM2JtsKbFQyRIkOWlu2P8+SrbidO0OTYe+xDI/8iNFUaTz6fMjZ70dUZqKahJEH8KgR6pCYFptJ8Hv98v+RdDTBlUYMVGRSXAgOvh8+eMPn/aZJsaAmu4BRaUzXkyC0hiZDQa6KAlH+oOQpAJwIxRHBl7VdsCReqhlvxBcIkNzyqg5DOIwTIOWRkyCWlVZS9HntFBCi42xJpnYbGhB2oe3UK/x25jMRVFzUhnncaAIgxhEpUsqtWfjb2UDsPQku+9tYseZ19tH4Su2uxcKHy1eE541kEoURGs4IM58gLTqHCfPiI6+P4DvdouOCsyj0K1OIx+dRxA/I0gL8ngex0XLMQDLUx6Kz+NJjzy0S2yUvi2YEwJcn0URD30c9mHNT7g0Nrg8j86f0cDaIoNKpI8VaRnJeRscHekOvMu3Zq+pwAa6pblCqrnfbfnxIrvZVkKhnEE4UIY9qKSei87+woHYh1uSRye3ebALyM4ldJ1vQvDePpNEFXD1oGWFYTCwABS82KwNMkCUaUkYcz2sYASB3322VYhD9/ESZ4PJBtXM3KN8bYQEpR2C7Y3DiwYuD7IklesRf0L383gSjxq8KJFChSFqLVEB3maiMkowr4fFr8LMoNMpuIithet73Wrd9FCwqBCHhDzpiyuBiY28VvT1J2cNnPfIB/miIwE9X1FM7u1BrM2BkSUEv6bfyFWFv9TaUGB0O/8fEXwvAMgreP4KpXN/kGRJkKkhTe/kzJ3EklG5okoJdVNhqJ13c0Y3G6LAAYVaXEF5USX2Ls/XBGEYte/kt9bkD1CGmzu8h7J8mApjBL/uavjtft0VG5yWL3wwYO0Xd0KYo2p4tRiFadpEatEOiaNkmE5fQsbj0WI6fwn5GMbTuL2PT5H/9rO4SKOP4zbmNlKe2QH9m/IrW+493ljMEM8VRb2VHeEDq5GrhymtPJ4T6G3kFFnXuQf7/QbQHDG2hMR7wCWNZ5hqOScbt2YrpLYdb6uhXpRCb/py5LK9jqhflKhlg+4Vkk0Ze5UoSVpLWplbyr1c1/naW1XQjU+gusJfd8rlqUvPPjNQFq4d3CJXXk5Xmv70ri0/pta2dMgKSdlUYL6NJgGj29JEtmgMvGH40nMv+TZusdhhcYO5F1TYnYF2u+hksZed6A29bNjJEi9LOtnIy0adLPWy1MqgsxMFA+IBLoNfWvlGMCb2BF93+DNRkwRdIknmzfyA8hKNoB0ourfLyCNMJ4KpgQ9oSTFHj3ZYxa5gW22GDqI2T3QtZpXlUwY7ztvrP3hi7Er8X7HYuVZQKMf1gefdOPqpCZxRDa1DwuQyQnnsZ4dFSYZFcWNHcNKOunAxS5LxrIFHbuIZ113g3O/IZoo0wS3mTUeN6V/j4TxOZ7NlP41mi34SXVz1p4vxsD9Po2l4FS4Xw3j0d3tJ/X+Jy38AAAD//wMAUEsDBBQABgAIAAAAIQBo7TDYwQsAAJ5zAAAPAAAAd29yZC9zdHlsZXMueG1svJ1dc9u6EYbvO9P/wNFVe+HI8oeceI5zxnaS2tM4xydymmuIhCTUIKGSVGz31xcAKQnyEhQX3PrGlijtAxAv3iWWpKTffn9OZfSL54VQ2cVg9O5wEPEsVonI5heDHw9fDt4PoqJkWcKkyvjF4IUXg98//vUvvz2dF+WL5EWkAVlxnsYXg0VZLs+HwyJe8JQV79SSZ/rFmcpTVuqn+XyYsvxxtTyIVbpkpZgKKcqX4dHh4XhQY/IuFDWbiZh/UvEq5Vlp44c5l5qosmIhlsWa9tSF9qTyZJmrmBeF3ulUVryUiWyDGZ0AUCriXBVqVr7TO1P3yKJ0+OjQPkrlFnCKAxwBwDjmzzjG+5ox1JEuRyQ4znjDEYnDCeuMA0hWKMTR8bof5p8Jd1hFUiYLHG6t0dDEspItWLFwiRy3g6cb3EtqxjuNz2/nmcrZVGqSnkGRngSRBZu/eizNP/uQP9vtZhfMA71jH7W7EhV/4jO2kmVhnub3ef20fmb/fVFZWURP56yIhXjQ3dRtpUI3e3OZFWKgX+GsKC8LwRpfXJgHja/ERelsvhKJGAxNi488z/TLv5i8GBxVm4r/bjZstlybTu1skyybr7cty4Or727nLgY8O/gxMZumuqmLAcsPJpc2cHRyLsWclatcpxrzzBKqjJQn13r/+XO5YtK8eVgPTPXfGa7l62e2l0sWC9spNiu5Tjyj8aHpgRQmzx2dflg/+b4yErJVqepGLKD6v8EOgWI6H+nsNKmSpH6Vz76q+JEnk1K/cDGwbemNP27vc6FynQgvBh9sm3rjhKfiRiQJz5w3ZguR8J8Lnv0oeLLd/ucXm8zqDbFaZfrx8dnYziJZJJ+fY740qVG/mjGj6TcTIM27V2LbuA3/zxo2qmVril9wZo4P0eg1wnYfhTgyEYWzt83M1at9t+9CNXT8Vg2dvFVDp2/V0PitGjp7q4bev1VDFvP/bEhkiT582PfDZgB1H8fjRjTHYzY0x+MlNMdjFTTH4wQ0xzPR0RzPPEZzPNMUwSlV7JuFzmQ/9sz2du7+Y0QYd/8hIYy7/wgQxt2f8MO4+/N7GHd/Og/j7s/eYdz9yRrPrZZa0a22WVb2dtlMqTJTJY/Morc3jWWaZYtmGp456PGcZCcJMFVmqw/EvWkxs8/3zxBr0vDjeWnqxUjNopmYm5Knd8d59otLteQRSxLNIwTmXBdlnhEJmdM5n/GcZzGnnNh0UFMJRtkqnRLMzSWbk7F4lhAP35pIkhQ2E1rXzwtjEkEwqVMW56p/1xQjyw9fRdF/rAwkulpJyYlY32immGX1rw0spn9pYDH9KwOL6V8YOJpRDVFNIxqpmkY0YDWNaNyq+Uk1bjWNaNxqGtG41bT+4/YgSmlTvLvqGHU/d3ctlbnM0bsfEzHP7FnZ3qT6nGl0z3I2z9lyEZmz2s1Yd5+x7Vyp5CV6oDimbUhU63o7Rcy5bJGt+g/oDo3KXBsekb02PCKDbXj9LXanl8lmgXZDU89MVtOy0bSW1Mm0EyZX1YK2v9tY2X+GbQ3wReQFmQ2asQQz+JtZzho5KTLftpf9O7Zl9bfV66xE2r0aSdBLqeJHmjR887LkuS7LHnuTvigp1RNP6IiTMlfVXHMtf2Ql6WT5z+lywQpha6UdRPdD/foGieiOLXvv0L1kIqPR7fNByoSM6FYQNw93X6MHtTRlphkYGuCVKkuVkjHrM4F/+8mnf6fp4KUugrMXor29JDo9ZGHXguAgU5FUQkTSy0yRCZJjqOX9k79MFcsTGtp9zqt7kkpORJywdFktOgi8pfPik84/BKshy/sXy4U5L0RlqgcSmHPasFhN/83j/qnum4pIzgz9sSrt+Ue71LXRdLj+y4QdXP8lglVTHx7M/CXY2R1c/53dwVHt7LVkRSG8l1CDeVS7u+ZR72//4q/mKany2UrSDeAaSDaCayDZECq5SrOCco8tj3CHLY96fwmnjOURnJKzvH/kIiETw8KolLAwKhksjEoDCyMVoP8dOg6s/206Dqz/vToVjGgJ4MCo5hnp4Z/oKo8Do5pnFkY1zyyMap5ZGNU8O/4U8dlML4LpDjEOkmrOOUi6A01W8nSpcpa/ECE/Sz5nBCdIK9p9rmbmwyoqq27iJkCac9SScLFd4ahE/smnZF0zLMp+EZwRZVIqRXRubXvAsZG7967tC7OfBOndhXvJYr5QMuG5Z5/8sbpenlQfy3jdfduNTqc9v4r5oowmi83ZfhczPtwbuS7Yd8L2N9g05uP1h1+awu54IlbpuqPwwxTj4+7BdkbvBJ/sD96uJHYiTztGwjbH+yO3q+SdyLOOkbDN9x0jrU93Itv88Inlj40T4axt/mxqPM/kO2ubRZvgxmbbJtImsmkKnrXNoh2rRJdxbK4WQHW6ecYf3808/niMi/wUjJ38lM6+8iPaDPad/xLmyI5Jmra9zd0TIO/bRXSnzPnnSlXn7XcuOHX/UNetXjhlBY8aOcfdL1ztZBn/OHZON35E57zjR3ROQH5Ep0zkDUelJD+lc27yIzonKT8Cna3gEQGXrWA8LlvB+JBsBSkh2arHKsCP6Lwc8CPQRoUItFF7rBT8CJRRQXiQUSEFbVSIQBsVItBGhQswnFFhPM6oMD7EqJASYlRIQRsVItBGhQi0USECbVSIQBs1cG3vDQ8yKqSgjQoRaKNCBNqodr3Yw6gwHmdUGB9iVEgJMSqkoI0KEWijQgTaqBCBNipEoI0KESijgvAgo0IK2qgQgTYqRKCNWn3UMNyoMB5nVBgfYlRICTEqpKCNChFoo0IE2qgQgTYqRKCNChEoo4LwIKNCCtqoEIE2KkSgjWovFvYwKozHGRXGhxgVUkKMCiloo0IE2qgQgTYqRKCNChFoo0IEyqggPMiokII2KkSgjQoRbfOzvkTpu81+hD/r6b1jv/ulq7pT392Pcruo4+6oda/8rO6fRbhS6jFq/ODhsa03ukHEVAplT1F7Lqu7XHtLBOrC5x/X7Z/wcek9v3Sp/iyEvWYK4CddI8E5lZO2Ke9GgiLvpG2mu5Fg1XnSln3dSHAYPGlLutaX65tS9OEIBLelGSd45Alvy9ZOOBzithztBMIRbsvMTiAc4LZ87ASeRiY5v44+7ThO4839pYDQNh0dwpmf0DYtoVbrdAyN0VU0P6Gren5CVxn9BJSeXgxeWD8KrbAfFSY1tBlW6nCj+glYqSEhSGqACZcaooKlhqgwqWFixEoNCVipw5OznxAkNcCESw1RwVJDVJjU8FCGlRoSsFJDAlbqngdkLyZcaogKlhqiwqSGizus1JCAlRoSsFJDQpDUABMuNUQFSw1RYVKDKhktNSRgpYYErNSQECQ1wIRLDVHBUkNUm9T2LMqO1CiFnXDcIswJxB2QnUBccnYCA6olJzqwWnIIgdUS1GqtOa5ackXzE7qq5yd0ldFPQOnpxeCF9aPQCvtRYVLjqqUmqcON6idgpcZVS16pcdVSq9S4aqlValy15JcaVy01SY2rlpqkDk/OfkKQ1LhqqVVqXLXUKjWuWvJLjauWmqTGVUtNUuOqpSapex6QvZhwqXHVUqvUuGrJLzWuWmqSGlctNUmNq5aapMZVS16pcdVSq9S4aqlValy15JcaVy01SY2rlpqkxlVLTVLjqiWv1LhqqVVqXLXUKjWuWrrTIYLgK6AmKcvLiO774m5YsShZ/y8n/JHlvFDyF08i2l39itrL4dPOz18Ztv21QP3+Uo+Z+QZ05+NKSfUNsDXQvvE22fxMlQk2PYnqXw+rN9sO15drqxZtIGwqXui24vq7qzxNmW+c5bpP8yVLcgWa9HxFre3Cduqt310P5nakqvftjFNrj0sz1Vt6q63AJcvahqeyi6+HH2r/7+ui7tBUVr+Wph/cZokGPNW/FFZ1NXlmFUq/fs2lvGPVu9XS/1bJZ2X16ujQflvBq9en1RfveeNzm6G9gOFuZ6qn9S+2eQa8+ir++tYBz6BPeCp1HmINA27vZOk71tverR8VH/8HAAD//wMAUEsDBBQABgAIAAAAIQC+fnZiXgEAANADAAAUAAAAd29yZC93ZWJTZXR0aW5ncy54bWyc01FPwjAQAOB3E//D0nfoQCGGMEiMwfhiTNQfUNoba2x7S1sc+Ou9TsAZXpgv67Xbfbnr2vlyZ032CT5odAUbDXOWgZOotNsU7P1tNbhjWYjCKWHQQcH2ENhycX01b2YNrF8hRvoyZKS4MLOyYFWM9YzzICuwIgyxBkcvS/RWRJr6DbfCf2zrgURbi6jX2ui45+M8n7ID4y9RsCy1hAeUWwsutvncgyERXah0HY5ac4nWoFe1RwkhUD/W/HhWaHdiRrdnkNXSY8AyDqmZQ0UtRemjvI2s+QUm/YDxGTCVsOtn3B0MTpldR6t+zvTkaNVx/ldMB1DbXsT45lhHGlJ6xwoqqqofd/xHPOWKKCoRqq4I/RqcnLi9Tftt5exp49CLtSGJTlBGhyBr4fSkvUxDG8KuXU8tpIAaW9AVwzpqq79ghf7eYxPA87QsjMHm5fmRJvzPPVx8AwAA//8DAFBLAwQUAAYACAAAACEAzMeYVf8BAADMBgAAEgAAAHdvcmQvZm9udFRhYmxlLnhtbNyTz46bMBDG75X6DpbvGwz5sylaslLbjVSp6qHaPoBjTLAW28jjhOTtOzYkixSttPTQw3IA843nx8zH+OHxpBtylA6UNQVNZ4wSaYQtldkX9M/z9m5NCXhuSt5YIwt6lkAfN58/PXR5ZY0HgvkGci0KWnvf5kkCopaaw8y20mCwsk5zj69un2juXg7tnbC65V7tVKP8OckYW9EB495DsVWlhPxuxUFL42N+4mSDRGugVi1caN17aJ11ZeuskADYs256nubKXDHp4gaklXAWbOVn2MxQUURhesriSjevgOU0QHYDWAl5msZYD4wEM8ccVU7jrK4cVY44/1bMCFAeJiGy+aWO8AjpIxaUvqyn4S7/KAm53POaQz0mymkNLq+4sw5+a5H/2Bvr+K5BEk4QwSEgERzu6GV4xKU8RT20EBbY2GY4XKTLDdeY/403audUDLTcWJApxo68KSh2smVLFjrK2ILNw50mYaOouQMZIP1G1ssV16o5X1ToFEAfaJUX9UU/cqdC7X0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      "documentId": 1234,
      "fileExtension": "docx",
      "name": "Termo de Reserva de Celular"
    }
  ],
  "emailSubject": "Simple Signing Example",
  "recipients": {
    "signers": b
      {
        "email": "fernandob@topdesk.com",
        "name": "Fernando Banik",
        "recipientId": "12345"
      }
    ]
  },
  "status": "sent"
}

@fbanik - Your payload looks mostly correct, but there are a few issues to address:

1. The documentId should be a string, not an integer.
2. Ensure that the Base64 encoded document content is correct and complete.

I found the error, I was using my wrong user account, now I changed here and it works, thank you John!