diff --git a/Elwig/Helpers/Export/Bki.cs b/Elwig/Helpers/Export/Bki.cs
new file mode 100644
index 0000000..fedea4a
--- /dev/null
+++ b/Elwig/Helpers/Export/Bki.cs
@@ -0,0 +1,4 @@
+namespace Elwig.Helpers.Export {
+    public class Bki {
+    }
+}
diff --git a/Elwig/Helpers/Export/Csv.cs b/Elwig/Helpers/Export/Csv.cs
new file mode 100644
index 0000000..79f91ab
--- /dev/null
+++ b/Elwig/Helpers/Export/Csv.cs
@@ -0,0 +1,4 @@
+namespace Elwig.Helpers.Export {
+    public class Csv {
+    }
+}
diff --git a/Elwig/Helpers/Export/Ebics.cs b/Elwig/Helpers/Export/Ebics.cs
new file mode 100644
index 0000000..337e001
--- /dev/null
+++ b/Elwig/Helpers/Export/Ebics.cs
@@ -0,0 +1,15 @@
+using Elwig.Models;
+using System;
+using System.Collections.Generic;
+using System.Threading.Tasks;
+
+namespace Elwig.Helpers.Export {
+    public class Ebics : IBankingProvider {
+
+        public string FileExtension => "xml";
+
+        public Task Export(string filename, int avnr, IEnumerable<Member> members) {
+            throw new NotImplementedException();
+        }
+    }
+}
diff --git a/Elwig/Helpers/Export/Elba.cs b/Elwig/Helpers/Export/Elba.cs
new file mode 100644
index 0000000..15be0c8
--- /dev/null
+++ b/Elwig/Helpers/Export/Elba.cs
@@ -0,0 +1,15 @@
+using Elwig.Models;
+using System;
+using System.Collections.Generic;
+using System.Threading.Tasks;
+
+namespace Elwig.Helpers.Export {
+    public class Elba : IBankingProvider {
+
+        public string FileExtension => "elba";
+
+        public Task Export(string filename, int avnr, IEnumerable<Member> members) {
+            throw new NotImplementedException();
+        }
+    }
+}
diff --git a/Elwig/Helpers/Export/IBankingProvider.cs b/Elwig/Helpers/Export/IBankingProvider.cs
new file mode 100644
index 0000000..a50282a
--- /dev/null
+++ b/Elwig/Helpers/Export/IBankingProvider.cs
@@ -0,0 +1,24 @@
+using Elwig.Models;
+using System.Collections.Generic;
+using System.Threading.Tasks;
+
+namespace Elwig.Helpers.Export {
+    /// <summary>
+    /// Interface for exporting banking data
+    /// </summary>
+    public interface IBankingProvider {
+        /// <summary>
+        /// The default file extension of the exported files to be used (whithout a preceding ".")
+        /// </summary>
+        string FileExtension { get; }
+
+        /// <summary>
+        /// Export the member payment data of the given payment variant to the given file.
+        /// (The amount of the last payed variant is deducted from the calculated amount.)
+        /// </summary>
+        /// <param name="filename">The file to export the data to</param>
+        /// <param name="avnr">The number of the payment variant to export</param>
+        /// <param name="members">The members whose data to include in the export</param>
+        Task Export(string filename, int avnr, IEnumerable<Member> members);
+    }
+}