Вытащил солюшен на уровень выше, чтобы прощё было дотнетить

Domains/VisaApplicationDomain/ApplicationStatus.cs

@@ -0,0 +1,11 @@
+namespace Domains.VisaApplicationDomain;
+
+public enum ApplicationStatus
+{
+    /// Waits for approve
+    Pending,
+    Approved,
+    Rejected,
+    /// Closed by applicant
+    Closed
+}

Domains/VisaApplicationDomain/PastVisa.cs

@@ -0,0 +1,17 @@
+using Domains.ApplicantDomain;
+
+namespace Domains.VisaApplicationDomain;
+
+/// Visa that <see cref="Applicant"/> already had
+/// <remarks>Owned</remarks>
+public class PastVisa
+{
+    /// Date of issue
+    public DateTime IssueDate { get; set; }
+
+    /// Name of visa
+    public string Name { get; set; } = null!;
+
+    /// Date when visa expires
+    public DateTime ExpirationDate { get; set; }
+}

Domains/VisaApplicationDomain/PastVisit.cs

@@ -0,0 +1,17 @@
+using Domains.ApplicantDomain;
+
+namespace Domains.VisaApplicationDomain;
+
+/// Visit in a Schengen country that <see cref="Applicant"/> already had
+/// <remarks>Owned</remarks>
+public class PastVisit
+{
+    /// First day of <see cref="PastVisit"/>
+    public DateTime StartDate { get; set; }
+
+    /// Last day of <see cref="PastVisit"/>
+    public DateTime EndDate { get; set; }
+
+    /// Destination country of <see cref="PastVisit"/>
+    public string DestinationCountry { get; set; } = null!;
+}

Domains/VisaApplicationDomain/PermissionToDestCountry.cs

@@ -0,0 +1,12 @@
+namespace Domains.VisaApplicationDomain;
+
+/// Permission to enter the destination country
+/// <remarks>Owned</remarks>
+public class PermissionToDestCountry
+{
+    /// Date when <see cref="PermissionToDestCountry"/> expires
+    public DateTime ExpirationDate { get; set; }
+
+    /// Issuing authority
+    public string Issuer { get; set; } = null!;
+}

Domains/VisaApplicationDomain/ReentryPermit.cs

@@ -0,0 +1,12 @@
+namespace Domains.VisaApplicationDomain;
+
+/// Permission to enter a country the issuer wants to come from
+/// <remarks>Owned</remarks>
+public class ReentryPermit
+{
+    /// Number of <see cref="ReentryPermit"/>
+    public string Number { get; set; } = null!;
+
+    /// Date when <see cref="ReentryPermit"/> expires
+    public DateTime ExpirationDate { get; set; }
+}

Domains/VisaApplicationDomain/RequestedNumberOfEntries.cs

@@ -0,0 +1,9 @@
+namespace Domains.VisaApplicationDomain;
+
+/// Requested number of entries
+public enum RequestedNumberOfEntries
+{
+    Many,
+    One,
+    Two
+}

Domains/VisaApplicationDomain/VisaApplication.cs

@@ -0,0 +1,47 @@
+using Domains.ApplicantDomain;
+
+namespace Domains.VisaApplicationDomain;
+
+/// Model of visit request
+public class VisaApplication : IEntity
+{
+    /// Unique identifier of <see cref="VisaApplication"/>
+    public Guid Id { get; private set; } = Guid.NewGuid();
+
+    /// Identifier of the <see cref="Applicant"/>
+    public Guid ApplicantId { get; set; }
+
+    /// Status of application
+    public ApplicationStatus Status { get; set; }
+
+    /// <inheritdoc cref="Domains.VisaApplicationDomain.ReentryPermit"/>
+    /// <remarks>always null if <see cref="Applicant"/> is not a non-resident</remarks>
+    public ReentryPermit? ReentryPermit { get; set; }
+
+    /// Country that <see cref="Applicant"/> wants to visit
+    public string DestinationCountry { get; set; } = null!;
+
+    /// List of <see cref="PastVisa"/> that applicant had before
+    public List<PastVisa> PastVisas { get; set; } = null!;
+
+    /// Permission to enter the destination country of <see cref="Applicant"/>
+    /// <remarks>always null if <see cref="DestinationCountry"/> is Schengen</remarks>
+    public PermissionToDestCountry? PermissionToDestCountry { get; set; }
+
+    public List<PastVisit> PastVisits { get; set; } = null!;
+
+    /// <see cref="Domains.VisaApplicationDomain.VisaCategory"/>
+    public VisaCategory VisaCategory { get; set; }
+
+    /// Is for group
+    public bool ForGroup { get; set; }
+
+    /// <see cref="Domains.VisaApplicationDomain.RequestedNumberOfEntries"/>
+    public RequestedNumberOfEntries RequestedNumberOfEntries { get; set; }
+
+    /// When application was created
+    public DateTime RequestDate { get; set; }
+
+    /// Valid days requested
+    public int ValidDaysRequested { get; set; }
+}

Domains/VisaApplicationDomain/VisaCategory.cs

@@ -0,0 +1,8 @@
+namespace Domains.VisaApplicationDomain;
+
+/// Category of visa
+public enum VisaCategory
+{
+    Transit,
+    ShortDated
+}