Created Appointment creation flow.

src/main/java/net/gepafin/tendermanagement/model/response/AppointmentCreationResponse.java

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+package net.gepafin.tendermanagement.model.response;
+
+import lombok.Data;
+
+@Data
+public class AppointmentCreationResponse {
+    private String appointmentId;
+}

src/main/java/net/gepafin/tendermanagement/model/response/AppointmentLoginResponse.java

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+package net.gepafin.tendermanagement.model.response;
+
+import lombok.Data;
+
+@Data
+public class AppointmentLoginResponse {
+
+    private String tokenId;
+    private String areaCode;
+    private Long companyId;
+    private String codecFiscale;
+    private String vatNumber;
+    private String ndg;
+    private String message;
+    private String idVisura;
+}

src/main/java/net/gepafin/tendermanagement/model/response/DocumentUploadResponse.java

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+package net.gepafin.tendermanagement.model.response;
+
+import lombok.Data;
+
+@Data
+public class DocumentUploadResponse {
+    private String documentAttachmentId;
+}

src/main/java/net/gepafin/tendermanagement/model/response/NdgResponse.java

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+package net.gepafin.tendermanagement.model.response;
+
+import lombok.Data;
+
+@Data
+public class NdgResponse {
+    private String ndg;
+}