diff --git a/auth/src/test/java/com/baiyue/auth/repository/LoginIdentifierContractTest.java b/auth/src/test/java/com/baiyue/auth/repository/LoginIdentifierContractTest.java
index 0b471f746..5ce5d40e9 100644
--- a/auth/src/test/java/com/baiyue/auth/repository/LoginIdentifierContractTest.java
+++ b/auth/src/test/java/com/baiyue/auth/repository/LoginIdentifierContractTest.java
@@ -7,11 +7,21 @@ import org.junit.jupiter.api.Test;
 import org.springframework.core.io.ClassPathResource;
 
 import java.nio.charset.StandardCharsets;
+import java.util.Arrays;
 
 import static org.assertj.core.api.Assertions.assertThat;
 
 class LoginIdentifierContractTest {
 
+    @Test
+    void registrationExposesAnAccountPhoneInsteadOfALegalPersonPhoneAlias() {
+        var componentNames = Arrays.stream(MerchantRegisterRequest.class.getRecordComponents())
+                .map(component -> component.getName())
+                .toList();
+
+        assertThat(componentNames).contains("phone").doesNotContain("legalPhone");
+    }
+
     @Test
     void mainlandMobileRuleRejectsPlaceholderNumbersAcrossJavaAndSql() throws Exception {
         try (var factory = Validation.buildDefaultValidatorFactory()) {
diff --git a/iam/src/test/java/com/baiyue/iam/controller/IamOpenApiContractTest.java b/iam/src/test/java/com/baiyue/iam/controller/IamOpenApiContractTest.java
index c8d8a0959..9c8b8afe3 100644
--- a/iam/src/test/java/com/baiyue/iam/controller/IamOpenApiContractTest.java
+++ b/iam/src/test/java/com/baiyue/iam/controller/IamOpenApiContractTest.java
@@ -54,6 +54,10 @@ class IamOpenApiContractTest {
                 .contains("UpdateMemberRequest:")
                 .contains("membershipId: {type: integer, format: int64}")
                 .contains("roleIds: {type: array, items: {type: integer, format: int64}}")
+                .contains("/api/platform/v1/iam/tenants/administrator-phone-availability:")
+                .doesNotContain("/api/platform/v1/iam/tenants/contact-phone-availability:")
+                .contains("公司联系电话，不作为登录标识且不要求跨企业唯一")
+                .contains("法人身份证、货代资质证书和银行开户许可证选填")
                 .contains("'422': {$ref: '#/components/responses/UnprocessableEntity'}");
 
         Map<String, Object> openApi = new Yaml().load(document);
diff --git a/iam/src/test/java/com/baiyue/iam/repository/IdentityContactDecouplingContractTest.java b/iam/src/test/java/com/baiyue/iam/repository/IdentityContactDecouplingContractTest.java
new file mode 100644
index 000000000..32a424e52
--- /dev/null
+++ b/iam/src/test/java/com/baiyue/iam/repository/IdentityContactDecouplingContractTest.java
@@ -0,0 +1,23 @@
+package com.baiyue.iam.repository;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.core.io.ClassPathResource;
+
+import java.nio.charset.StandardCharsets;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class IdentityContactDecouplingContractTest {
+
+    @Test
+    void baselineKeepsCompanyContactNonUniqueAndUserPhoneAsLoginIdentity() throws Exception {
+        String sql = new ClassPathResource("db/iam.sql")
+                .getContentAsString(StandardCharsets.UTF_8);
+
+        assertThat(sql)
+                .contains("公司联系电话，非登录标识且不要求跨企业唯一")
+                .contains("用户登录手机号，与企业联系电话独立")
+                .doesNotContain("UNIQUE KEY uk_iam_tenant_contact_phone")
+                .doesNotContain("UNIQUE KEY uk_tenant_contact_phone");
+    }
+}