diff --git a/src/main/java/eu/openaire/urls_worker/models/Assignment.java b/src/main/java/eu/openaire/urls_worker/models/Assignment.java
new file mode 100644
index 0000000..887b07b
--- /dev/null
+++ b/src/main/java/eu/openaire/urls_worker/models/Assignment.java
@@ -0,0 +1,66 @@
+package eu.openaire.urls_worker.models;
+
+import com.fasterxml.jackson.annotation.JsonInclude;
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.annotation.JsonPropertyOrder;
+
+import java.util.Date;
+import java.util.List;
+
+
+@JsonInclude(JsonInclude.Include.NON_NULL)
+@JsonPropertyOrder({
+        "tasks",
+        "workerId",
+        "date"
+})
+public class Assignment {
+
+    @JsonProperty("tasks")
+    private List<Task> tasks;
+
+    @JsonProperty("workerId")
+    private String workerId;
+
+    @JsonProperty("date")
+    private Date date;
+
+    public Assignment(List<Task> tasks, String workerId, Date date) {
+        this.tasks = tasks;
+        this.workerId = workerId;
+        this.date = date;
+    }
+
+    public List<Task> getTasks() {
+        return tasks;
+    }
+
+    public void setTasks(List<Task> tasks) {
+        this.tasks = tasks;
+    }
+
+    public String getWorkerId() {
+        return workerId;
+    }
+
+    public void setWorkerId(String workerId) {
+        this.workerId = workerId;
+    }
+
+    public Date getDate() {
+        return date;
+    }
+
+    public void setDate(Date date) {
+        this.date = date;
+    }
+
+    @Override
+    public String toString() {
+        return "Assignment{" +
+                "tasks=" + tasks +
+                ", workerId='" + workerId + '\'' +
+                ", date=" + date +
+                '}';
+    }
+}
diff --git a/src/main/java/eu/openaire/urls_worker/models/UrlReport.java b/src/main/java/eu/openaire/urls_worker/models/UrlReport.java
new file mode 100644
index 0000000..b7cbe5e
--- /dev/null
+++ b/src/main/java/eu/openaire/urls_worker/models/UrlReport.java
@@ -0,0 +1,55 @@
+package eu.openaire.urls_worker.models;
+
+import com.fasterxml.jackson.annotation.JsonInclude;
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.annotation.JsonPropertyOrder;
+
+
+@JsonInclude(JsonInclude.Include.NON_NULL)
+@JsonPropertyOrder({
+        "task",
+        "status",
+        "payload"
+})
+public class UrlReport {
+
+    @JsonProperty("task")
+    private Task task;
+
+    @JsonProperty("status")
+    private String Status;
+
+    @JsonProperty("payload")
+    private Payload payload;
+
+
+    public UrlReport(Task task, String status, Payload payload) {
+        this.task = task;
+        Status = status;
+        this.payload = payload;
+    }
+
+    public Task getTask() {
+        return task;
+    }
+
+    public void setTask(Task task) {
+        this.task = task;
+    }
+
+    public String getStatus() {
+        return Status;
+    }
+
+    public void setStatus(String status) {
+        Status = status;
+    }
+
+    public Payload getPayload() {
+        return payload;
+    }
+
+    public void setPayload(Payload payload) {
+        this.payload = payload;
+    }
+}
diff --git a/src/main/java/eu/openaire/urls_worker/payloads/requests/AssignmentRequest.java b/src/main/java/eu/openaire/urls_worker/payloads/requests/AssignmentRequest.java
new file mode 100644
index 0000000..a480edc
--- /dev/null
+++ b/src/main/java/eu/openaire/urls_worker/payloads/requests/AssignmentRequest.java
@@ -0,0 +1,32 @@
+package eu.openaire.urls_worker.payloads.requests;
+
+import com.fasterxml.jackson.annotation.JsonInclude;
+import com.fasterxml.jackson.annotation.JsonProperty;
+import eu.openaire.urls_worker.models.Assignment;
+
+
+@JsonInclude(JsonInclude.Include.NON_NULL)
+public class AssignmentRequest {
+
+    @JsonProperty("assignment")
+    private Assignment assignment;
+
+    public AssignmentRequest(Assignment assignment) {
+        this.assignment = assignment;
+    }
+
+    public Assignment getAssignment() {
+        return assignment;
+    }
+
+    public void setAssignment(Assignment assignment) {
+        this.assignment = assignment;
+    }
+
+    @Override
+    public String toString() {
+        return "AssignmentRequest{" +
+                "assignment=" + assignment +
+                '}';
+    }
+}
diff --git a/src/main/java/eu/openaire/urls_worker/payloads/responces/WorkerReport.java b/src/main/java/eu/openaire/urls_worker/payloads/responces/WorkerReport.java
new file mode 100644
index 0000000..3db3fcc
--- /dev/null
+++ b/src/main/java/eu/openaire/urls_worker/payloads/responces/WorkerReport.java
@@ -0,0 +1,44 @@
+package eu.openaire.urls_worker.payloads.responces;
+
+import com.fasterxml.jackson.annotation.JsonInclude;
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.annotation.JsonPropertyOrder;
+import eu.openaire.urls_worker.models.UrlReport;
+
+import java.util.List;
+
+
+@JsonInclude(JsonInclude.Include.NON_NULL)
+@JsonPropertyOrder({
+        "workerId",
+        "url"
+})
+public class WorkerReport {
+
+    @JsonProperty("workerId")
+    private String workerId;
+
+    @JsonProperty("urlReports")
+    private List<UrlReport> urlReports;
+
+    public WorkerReport(String workerId, List<UrlReport> urlReports) {
+        this.workerId = workerId;
+        this.urlReports = urlReports;
+    }
+
+    public String getWorkerId() {
+        return workerId;
+    }
+
+    public void setWorkerId(String workerId) {
+        this.workerId = workerId;
+    }
+
+    public List<UrlReport> getUrlReports() {
+        return urlReports;
+    }
+
+    public void setUrlReports(List<UrlReport> urlReports) {
+        this.urlReports = urlReports;
+    }
+}
diff --git a/src/main/java/eu/openaire/urls_worker/payloads/responces/WorkerResponse.java b/src/main/java/eu/openaire/urls_worker/payloads/responces/WorkerResponse.java
new file mode 100644
index 0000000..29c0032
--- /dev/null
+++ b/src/main/java/eu/openaire/urls_worker/payloads/responces/WorkerResponse.java
@@ -0,0 +1,49 @@
+package eu.openaire.urls_worker.payloads.responces;
+
+import com.fasterxml.jackson.annotation.JsonInclude;
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.annotation.JsonPropertyOrder;
+
+
+@JsonInclude(JsonInclude.Include.NON_NULL)
+@JsonPropertyOrder({
+        "workerId",
+        "tasksLimit"
+})
+public class WorkerResponse {
+
+    @JsonProperty("workerId")
+    private String workerId;
+
+    @JsonProperty("tasksLimit")
+    private int tasksLimit;
+
+    public WorkerResponse(String workerId, int tasksLimit) {
+        this.workerId = workerId;
+        this.tasksLimit = tasksLimit;
+    }
+
+    public String getWorkerId() {
+        return workerId;
+    }
+
+    public void setWorkerId(String workerId) {
+        this.workerId = workerId;
+    }
+
+    public int getTasksLimit() {
+        return tasksLimit;
+    }
+
+    public void setTasksLimit(int tasksLimit) {
+        this.tasksLimit = tasksLimit;
+    }
+
+    @Override
+    public String toString() {
+        return "WorkerRequest{" +
+                "id='" + workerId + '\'' +
+                ", tasksLimit=" + tasksLimit +
+                '}';
+    }
+}
diff --git a/src/main/java/eu/openaire/urls_worker/util/WorkerConstants.java b/src/main/java/eu/openaire/urls_worker/util/WorkerConstants.java
new file mode 100644
index 0000000..dd66d43
--- /dev/null
+++ b/src/main/java/eu/openaire/urls_worker/util/WorkerConstants.java
@@ -0,0 +1,7 @@
+package eu.openaire.urls_worker.util;
+
+public interface WorkerConstants {
+
+    String WORKER_ID = "worker_1";  // This should be different for every deployment of a Worker.
+    int TASKS_LIMIT = 10000;
+}