add sub account deletion

examples/java/io/mailtrap/examples/organizations/SubAccountsExample.java

@@ -26,5 +26,9 @@ public static void main(String[] args) {
         final var createdSubAccount = client.organizationsApi().subAccounts()
             .createSubAccount(ORGANIZATION_ID, createRequest);
         System.out.println(createdSubAccount);
+
+        // Permanent – removes all sub account data. Deleting the last sub account deletes the organization.
+        client.organizationsApi().subAccounts().deleteSubAccount(ORGANIZATION_ID, createdSubAccount.getId());
+        System.out.println("Sub account " + createdSubAccount.getId() + " deleted");
     }
 }

src/main/java/io/mailtrap/api/subaccounts/SubAccounts.java

@@ -26,4 +26,17 @@ public interface SubAccounts {
      */
     SubAccount createSubAccount(long organizationId, CreateSubAccountRequest request);
 
+    /**
+     * Delete a sub account from the specified organization.
+     * Requires sub account management permissions for the organization.
+     * <p>
+     * Deletion is permanent and removes all sub account data. Deleting the last sub account
+     * of an organization deletes the organization as well. A repeated call for the same
+     * sub account fails with 404. Rate limit – 10 requests per minute per organization.
+     *
+     * @param organizationId unique organization ID
+     * @param subAccountId   unique sub account ID
+     */
+    void deleteSubAccount(long organizationId, long subAccountId);
+
 }

src/main/java/io/mailtrap/api/subaccounts/SubAccountsImpl.java

@@ -34,4 +34,13 @@ public SubAccount createSubAccount(final long organizationId, final CreateSubAcc
             SubAccount.class
         );
     }
+
+    @Override
+    public void deleteSubAccount(final long organizationId, final long subAccountId) {
+        httpClient.delete(
+            String.format(apiHost + "/api/organizations/%d/sub_accounts/%d", organizationId, subAccountId),
+            new RequestData(),
+            Void.class
+        );
+    }
 }

src/test/java/io/mailtrap/api/subaccounts/SubAccountsImplTest.java

@@ -14,12 +14,14 @@
 
 import java.util.List;
 
+import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertNotNull;
 
 class SubAccountsImplTest extends BaseTest {
 
     private final long organizationId = 1001L;
+    private final long subAccountId = 12345L;
 
     private SubAccounts api;
 
@@ -30,7 +32,10 @@ public void init() {
                         "GET", null, "api/subaccounts/getSubAccountsResponse.json"),
 
                 DataMock.build(Constants.GENERAL_HOST + "/api/organizations/" + organizationId + "/sub_accounts",
-                        "POST", "api/subaccounts/createSubAccountRequest.json", "api/subaccounts/createSubAccountResponse.json")
+                        "POST", "api/subaccounts/createSubAccountRequest.json", "api/subaccounts/createSubAccountResponse.json"),
+
+                DataMock.build(Constants.GENERAL_HOST + "/api/organizations/" + organizationId + "/sub_accounts/" + subAccountId,
+                        "DELETE", null, null)
         ));
 
         final MailtrapConfig testConfig = new MailtrapConfig.Builder()
@@ -61,4 +66,9 @@ void test_createSubAccount() {
         assertEquals(12347L, response.getId());
         assertEquals("New Team Account", response.getName());
     }
+
+    @Test
+    void test_deleteSubAccount() {
+        assertDoesNotThrow(() -> api.deleteSubAccount(organizationId, subAccountId));
+    }
 }