Create a new contribution

{
  "type": "object",
  "properties": {
    "assignment": {
      "type": "object",
      "properties": {
        "allowsAnonymousContributions": {
          "type": "boolean"
        },
        "callToAction": {
          "type": "string",
          "description": "An optional call to action specific to this assignment. ie. Submit your snow pictures."
        },
        "cover": {
          "type": "object",
          "properties": {
            "artifacts": {
              "type": "array",
              "items": {
                "type": "object",
                "properties": {
                  "contentLength": {
                    "type": "number"
                  },
                  "contentType": {
                    "type": "string"
                  },
                  "height": {
                    "type": "number"
                  },
                  "label": {
                    "type": "string"
                  },
                  "url": {
                    "type": "string"
                  },
                  "width": {
                    "type": "number"
                  }
                }
              }
            },
            "id": {
              "type": "string"
            },
            "media": {
              "type": "object",
              "properties": {
                "duration": {
                  "type": "number"
                },
                "id": {
                  "type": "string"
                },
                "place": {
                  "type": "object",
                  "properties": {
                    "country": {
                      "type": "string"
                    },
                    "geohash": {
                      "type": "string"
                    },
                    "google": {
                      "type": "string"
                    },
                    "latLong": {
                      "type": "object",
                      "properties": {
                        "latitude": {
                          "type": "number",
                          "format": "double"
                        },
                        "longitude": {
                          "type": "number",
                          "format": "double"
                        }
                      }
                    },
                    "name": {
                      "type": "string"
                    },
                    "osm": {
                      "type": "object",
                      "properties": {
                        "osmId": {
                          "type": "number"
                        },
                        "osmType": {
                          "type": "string"
                        }
                      }
                    }
                  }
                },
                "type": {
                  "type": "string"
                }
              }
            }
          }
        },
        "created": {
          "type": "string",
          "format": "date-time"
        },
        "description": {
          "type": "string"
        },
        "embargo": {
          "type": "string",
          "format": "date-time"
        },
        "ends": {
          "type": "string",
          "format": "date-time"
        },
        "featured": {
          "type": "boolean"
        },
        "id": {
          "type": "string"
        },
        "mediaRequired": {
          "type": "boolean"
        },
        "moderator": {
          "type": "string",
          "description": "Optional credential id of the moderator who owns this particular assignment."
        },
        "name": {
          "type": "string"
        },
        "open": {
          "type": "boolean",
          "description": "Helper value. Is this assignment currently open? Based on the value of the ends field."
        },
        "receiptMessage": {
          "type": "string",
          "description": "An optional assignment specific message to be displayed on successful contribution submission. For example, this might be used to inform contributors of assignment specific moderation time frames."
        },
        "starts": {
          "type": "string",
          "format": "date-time"
        },
        "tags": {
          "type": "array",
          "items": {
            "type": "object",
            "required": [
              "id",
              "name"
            ],
            "properties": {
              "colour": {
                "type": "string",
                "description": "Optional HTML hexcode colour"
              },
              "id": {
                "type": "string"
              },
              "name": {
                "type": "string"
              },
              "tagSet": {
                "type": "object",
                "required": [
                  "id",
                  "name"
                ],
                "properties": {
                  "id": {
                    "type": "string"
                  },
                  "name": {
                    "type": "string"
                  }
                }
              },
              "urlWords": {
                "type": "string"
              }
            }
          }
        },
        "urlWords": {
          "type": "string"
        },
        "webUrl": {
          "type": "string"
        }
      }
    },
    "attribution": {
      "type": "string",
      "description": "The public attribution for this contribution. This will be the display name of the registered user or the contributor's first and last name if they provided them while making a non authenticated contribution. A blank attribution field indicates and anonymous contribution."
    },
    "body": {
      "type": "string"
    },
    "created": {
      "type": "string",
      "format": "date-time"
    },
    "headline": {
      "type": "string"
    },
    "id": {
      "type": "string"
    },
    "mediaUsages": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "artifacts": {
            "type": "array",
            "items": {
              "type": "object",
              "properties": {
                "contentLength": {
                  "type": "number"
                },
                "contentType": {
                  "type": "string"
                },
                "height": {
                  "type": "number"
                },
                "label": {
                  "type": "string"
                },
                "url": {
                  "type": "string"
                },
                "width": {
                  "type": "number"
                }
              }
            }
          },
          "id": {
            "type": "string"
          },
          "media": {
            "type": "object",
            "properties": {
              "duration": {
                "type": "number"
              },
              "id": {
                "type": "string"
              },
              "place": {
                "type": "object",
                "properties": {
                  "country": {
                    "type": "string"
                  },
                  "geohash": {
                    "type": "string"
                  },
                  "google": {
                    "type": "string"
                  },
                  "latLong": {
                    "type": "object",
                    "properties": {
                      "latitude": {
                        "type": "number",
                        "format": "double"
                      },
                      "longitude": {
                        "type": "number",
                        "format": "double"
                      }
                    }
                  },
                  "name": {
                    "type": "string"
                  },
                  "osm": {
                    "type": "object",
                    "properties": {
                      "osmId": {
                        "type": "number"
                      },
                      "osmType": {
                        "type": "string"
                      }
                    }
                  }
                }
              },
              "type": {
                "type": "string"
              }
            }
          }
        }
      }
    },
    "moderationHistory": {
      "type": "array",
      "items": {
        "type": "object",
        "required": [
          "date"
        ],
        "properties": {
          "action": {
            "type": "object",
            "required": [
              "id",
              "label",
              "resultingState"
            ],
            "properties": {
              "id": {
                "type": "string"
              },
              "label": {
                "type": "string"
              },
              "resultingState": {
                "type": "object",
                "required": [
                  "id",
                  "label",
                  "public"
                ],
                "properties": {
                  "id": {
                    "type": "string"
                  },
                  "label": {
                    "type": "string"
                  },
                  "public": {
                    "type": "boolean"
                  }
                }
              }
            }
          },
          "date": {
            "type": "string",
            "format": "date-time"
          },
          "notes": {
            "type": "string"
          }
        }
      }
    },
    "place": {
      "type": "object",
      "properties": {
        "country": {
          "type": "string"
        },
        "geohash": {
          "type": "string"
        },
        "google": {
          "type": "string"
        },
        "latLong": {
          "type": "object",
          "properties": {
            "latitude": {
              "type": "number",
              "format": "double"
            },
            "longitude": {
              "type": "number",
              "format": "double"
            }
          }
        },
        "name": {
          "type": "string"
        },
        "osm": {
          "type": "object",
          "properties": {
            "osmId": {
              "type": "number"
            },
            "osmType": {
              "type": "string"
            }
          }
        }
      }
    },
    "urlWords": {
      "type": "string"
    },
    "via": {
      "type": "object",
      "properties": {
        "authority": {
          "type": "object",
          "properties": {
            "client": {
              "type": "object",
              "properties": {
                "id": {
                  "type": "string"
                },
                "name": {
                  "type": "string"
                }
              }
            },
            "id": {
              "type": "string"
            },
            "user": {
              "type": "object",
              "properties": {
                "bio": {
                  "type": "string"
                },
                "displayName": {
                  "type": "string"
                },
                "id": {
                  "type": "string"
                },
                "registered": {
                  "type": "string",
                  "format": "date-time"
                },
                "username": {
                  "type": "string"
                }
              }
            }
          }
        },
        "ipAddress": {
          "type": "string"
        },
        "ipAddressPlace": {
          "type": "object",
          "properties": {
            "country": {
              "type": "string"
            },
            "geohash": {
              "type": "string"
            },
            "google": {
              "type": "string"
            },
            "latLong": {
              "type": "object",
              "properties": {
                "latitude": {
                  "type": "number",
                  "format": "double"
                },
                "longitude": {
                  "type": "number",
                  "format": "double"
                }
              }
            },
            "name": {
              "type": "string"
            },
            "osm": {
              "type": "object",
              "properties": {
                "osmId": {
                  "type": "number"
                },
                "osmType": {
                  "type": "string"
                }
              }
            }
          }
        }
      }
    }
  }
}