diff --git a/src/main/java/com/gxwebsoft/shop/controller/ShopOrderController.java b/src/main/java/com/gxwebsoft/shop/controller/ShopOrderController.java
index 2e95ea8..4a10e2a 100644
--- a/src/main/java/com/gxwebsoft/shop/controller/ShopOrderController.java
+++ b/src/main/java/com/gxwebsoft/shop/controller/ShopOrderController.java
@@ -19,6 +19,7 @@ import com.gxwebsoft.shop.task.OrderAutoCancelTask;
 import com.gxwebsoft.shop.entity.ShopOrder;
 import com.gxwebsoft.shop.param.ShopOrderParam;
 import com.gxwebsoft.shop.dto.OrderCreateRequest;
+import com.gxwebsoft.shop.dto.OrderPrepayRequest;
 import com.gxwebsoft.shop.dto.UpdatePaymentStatusRequest;
 import com.gxwebsoft.payment.service.PaymentService;
 import com.gxwebsoft.payment.dto.PaymentResponse;
@@ -170,6 +171,92 @@ public class ShopOrderController extends BaseController {
         return fail("添加失败");
     }
 
+    @Operation(summary = "发起支付/重新支付（兼容 pay/prepay/repay）")
+    @PostMapping({"/pay", "/prepay", "/repay"})
+    public ApiResult<?> prepay(@RequestBody OrderPrepayRequest request) {
+        User loginUser = getLoginUser();
+        if (loginUser == null) {
+            return fail("用户未登录");
+        }
+
+        // 允许从请求显式传 tenantId（兼容一些历史调用），否则优先从请求头/登录态推断
+        Integer tenantId = request != null ? request.getTenantId() : null;
+        if (tenantId == null) {
+            tenantId = ObjectUtil.defaultIfNull(getTenantId(), loginUser.getTenantId());
+        }
+
+        if (request == null || (request.getOrderId() == null && StrUtil.isBlank(request.getOrderNo()))) {
+            return fail("orderId 或 orderNo 不能为空");
+        }
+
+        ShopOrder order;
+        if (request.getOrderId() != null) {
+            order = shopOrderService.getById(request.getOrderId());
+        } else {
+            if (tenantId == null) {
+                return fail("tenantId 不能为空");
+            }
+            order = shopOrderService.getByOrderNo(request.getOrderNo(), tenantId);
+        }
+        if (order == null) {
+            return fail("订单不存在");
+        }
+
+        // 校验租户（避免用别的租户订单号撞库）
+        if (tenantId != null && order.getTenantId() != null && !tenantId.equals(order.getTenantId())) {
+            return fail("订单不存在");
+        }
+
+        // 普通用户只能操作自己的订单；管理员可越权（复用取消权限判断即可）
+        if (!loginUser.getUserId().equals(order.getUserId()) && !hasOrderCancelAuthority()) {
+            return fail("无权限操作此订单");
+        }
+
+        // 业务状态校验：这些错误需要明确返回（code!=0），避免前端误判为接口不支持而降级走创建订单
+        if (Boolean.TRUE.equals(order.getPayStatus())) {
+            return fail("订单已支付");
+        }
+        if (order.getDeleted() != null && order.getDeleted() == 1) {
+            return fail("订单已删除");
+        }
+        if (order.getOrderStatus() != null) {
+            // 2=已取消；6=退款成功；7=客户端申请退款；其他非0状态也视为不可再次发起支付
+            if (!Objects.equals(order.getOrderStatus(), 0)) {
+                return fail("订单状态不允许发起支付");
+            }
+        }
+        if (order.getExpirationTime() != null && order.getExpirationTime().isBefore(LocalDateTime.now())) {
+            return fail("订单已过期");
+        }
+
+        // 补齐 createWxOrder 所需字段（注意：openid 在 ShopOrder 上是非持久化字段，查询出来为空）
+        Integer payType = request.getPayType() != null ? request.getPayType() : order.getPayType();
+        if (payType == null) {
+            payType = 1;
+        }
+        if (!Objects.equals(payType, 1) && !Objects.equals(payType, 102)) {
+            return fail("该订单不支持发起微信支付");
+        }
+        order.setPayType(payType);
+        order.setPayUserId(loginUser.getUserId());
+        order.setOpenid(loginUser.getOpenid());
+        if (order.getPayPrice() == null) {
+            order.setPayPrice(ObjectUtil.defaultIfNull(order.getTotalPrice(), BigDecimal.ZERO));
+        }
+        if (StrUtil.isBlank(order.getComments())) {
+            order.setComments("订单支付");
+        }
+
+        try {
+            Map<String, String> wxOrderInfo = shopOrderService.createWxOrder(order);
+            return success(wxOrderInfo);
+        } catch (Exception e) {
+            logger.error("发起支付失败 - userId={}, orderId={}, orderNo={}",
+                    loginUser.getUserId(), order.getOrderId(), order.getOrderNo(), e);
+            return fail("发起支付失败：" + e.getMessage());
+        }
+    }
+
     @PreAuthorize("hasAuthority('shop:shopOrder:update')")
     @Operation(summary = "修改订单")
     @PutMapping()
diff --git a/src/main/java/com/gxwebsoft/shop/dto/OrderPrepayRequest.java b/src/main/java/com/gxwebsoft/shop/dto/OrderPrepayRequest.java
new file mode 100644
index 0000000..9690c6b
--- /dev/null
+++ b/src/main/java/com/gxwebsoft/shop/dto/OrderPrepayRequest.java
@@ -0,0 +1,32 @@
+package com.gxwebsoft.shop.dto;
+
+import io.swagger.v3.oas.annotations.media.Schema;
+import lombok.Data;
+
+import javax.validation.constraints.Positive;
+
+/**
+ * 订单重新发起支付请求DTO
+ *
+ * 前端会按 /shop/shop-order/pay -> /prepay -> /repay 依次尝试。
+ * 后端可统一实现为同一套逻辑（多个URL别名），避免出现 404 导致前端误判为不支持接口。
+ */
+@Data
+@Schema(name = "OrderPrepayRequest", description = "订单重新发起支付请求")
+public class OrderPrepayRequest {
+
+    @Schema(description = "订单ID（二选一：orderId 或 orderNo）")
+    @Positive(message = "订单ID必须为正数")
+    private Integer orderId;
+
+    @Schema(description = "订单号（二选一：orderId 或 orderNo）")
+    private String orderNo;
+
+    @Schema(description = "支付方式：1=微信支付，102=微信Native（兼容旧类型）。不传则使用订单原支付方式/默认微信支付")
+    private Integer payType;
+
+    @Schema(description = "租户ID（可选；不传则从当前登录用户/请求头推断）")
+    @Positive(message = "租户ID必须为正数")
+    private Integer tenantId;
+}
+