diff --git a/finnow-api/source/api_mapping.d b/finnow-api/source/api_mapping.d
index 4512919..ef3b4b6 100644
--- a/finnow-api/source/api_mapping.d
+++ b/finnow-api/source/api_mapping.d
@@ -64,6 +64,10 @@ HttpRequestHandler mapApiHandlers(string webOrigin) {
 	a.map(HttpMethod.DELETE, PROFILE_PATH ~ "/vendors/:vendorId:ulong", &handleDeleteVendor);
 
 	a.map(HttpMethod.GET, PROFILE_PATH ~ "/transactions", &handleGetTransactions);
+	a.map(HttpMethod.GET, PROFILE_PATH ~ "/transactions/:transactionId:ulong", &handleGetTransaction);
+	a.map(HttpMethod.POST, PROFILE_PATH ~ "/transactions", &handleAddTransaction);
+	a.map(HttpMethod.PUT, PROFILE_PATH ~ "/transactions/:transactionId:ulong", &handleUpdateTransaction);
+	a.map(HttpMethod.DELETE, PROFILE_PATH ~ "/transactions/:transactionId:ulong", &handleDeleteTransaction);
 
 	import data_api;
 	// Various other data endpoints:
diff --git a/finnow-api/source/transaction/api.d b/finnow-api/source/transaction/api.d
index fad121c..bd82195 100644
--- a/finnow-api/source/transaction/api.d
+++ b/finnow-api/source/transaction/api.d
@@ -4,6 +4,7 @@ import handy_http_primitives;
 import handy_http_data.json;
 import handy_http_handlers.path_handler;
 import slf4d;
+import std.typecons;
 
 import transaction.model;
 import transaction.data;
@@ -15,6 +16,8 @@ import util.money;
 import util.pagination;
 import util.data;
 
+// Transactions API
+
 immutable DEFAULT_TRANSACTION_PAGE = PageRequest(1, 10, [Sort("timestamp", SortDir.DESC)]);
 
 struct TransactionsListItemAccount {
@@ -65,6 +68,49 @@ void handleGetTransactions(ref ServerHttpRequest request, ref ServerHttpResponse
     writeJsonBody(response, responsePage);
 }
 
+void handleGetTransaction(ref ServerHttpRequest request, ref ServerHttpResponse response) {
+    // TODO
+}
+
+struct AddTransactionPayloadLineItem {
+    long valuePerItem;
+    ulong quantity;
+    string description;
+    Nullable!ulong categoryId;
+}
+
+struct AddTransactionPayload {
+    string timestamp;
+    ulong amount;
+    string currencyCode;
+    string description;
+    Nullable!ulong vendorId;
+    Nullable!ulong categoryId;
+    Nullable!ulong creditedAccountId;
+    Nullable!ulong debitedAccountId;
+    string[] tags;
+    AddTransactionPayloadLineItem[] lineItems;
+}
+
+void handleAddTransaction(ref ServerHttpRequest request, ref ServerHttpResponse response) {
+    ProfileDataSource ds = getProfileDataSource(request);
+    auto payload = readJsonBodyAs!AddTransactionPayload(request);
+    addTransaction2(ds, payload);
+}
+
+void handleUpdateTransaction(ref ServerHttpRequest request, ref ServerHttpResponse response) {
+    // TODO
+}
+
+void handleDeleteTransaction(ref ServerHttpRequest request, ref ServerHttpResponse response) {
+    ProfileDataSource ds = getProfileDataSource(request);
+    // TODO
+}
+
+private ulong getTransactionIdOrThrow(in ServerHttpRequest request) {
+    return getPathParamOrThrow(request, "transactionId");
+}
+
 // Vendors API
 
 void handleGetVendors(ref ServerHttpRequest request, ref ServerHttpResponse response) {
diff --git a/finnow-api/source/transaction/service.d b/finnow-api/source/transaction/service.d
index a18d8f6..56b0fb1 100644
--- a/finnow-api/source/transaction/service.d
+++ b/finnow-api/source/transaction/service.d
@@ -19,6 +19,10 @@ Page!TransactionsListItem getTransactions(ProfileDataSource ds, in PageRequest p
     return page; // Return an empty page for now!
 }
 
+void addTransaction2(ProfileDataSource ds, in AddTransactionPayload payload) {
+    // TODO
+}
+
 void addTransaction(
     ProfileDataSource ds,
     SysTime timestamp,