feature: clinic & lab invitation flow added. minimal ui implemented for organizations tab.

backend/prisma/migrations/20260505173000_add_organization_invitations/migration.sql

@@ -0,0 +1,33 @@
+-- CreateTable
+CREATE TABLE "organization_invitations" (
+    "id" TEXT NOT NULL,
+    "inviterOrganizationId" TEXT NOT NULL,
+    "inviterUserId" TEXT NOT NULL,
+    "invitedOrganizationId" TEXT,
+    "invitedOrganizationName" TEXT NOT NULL,
+    "invitedOwnerEmail" TEXT NOT NULL,
+    "invitedOrganizationType" TEXT NOT NULL,
+    "tokenHash" TEXT NOT NULL,
+    "expiresAt" TIMESTAMP(3) NOT NULL,
+    "acceptedAt" TIMESTAMP(3),
+    "revokedAt" TIMESTAMP(3),
+    "createdAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updatedAt" TIMESTAMP(3) NOT NULL,
+
+    CONSTRAINT "organization_invitations_pkey" PRIMARY KEY ("id")
+);
+
+-- CreateIndex
+CREATE UNIQUE INDEX "organization_invitations_tokenHash_key" ON "organization_invitations"("tokenHash");
+
+-- CreateIndex
+CREATE INDEX "organization_invitations_inviterOrganizationId_createdAt_idx" ON "organization_invitations"("inviterOrganizationId", "createdAt");
+
+-- CreateIndex
+CREATE INDEX "organization_invitations_invitedOwnerEmail_createdAt_idx" ON "organization_invitations"("invitedOwnerEmail", "createdAt");
+
+-- AddForeignKey
+ALTER TABLE "organization_invitations" ADD CONSTRAINT "organization_invitations_inviterOrganizationId_fkey" FOREIGN KEY ("inviterOrganizationId") REFERENCES "organizations"("id") ON DELETE CASCADE ON UPDATE CASCADE;
+
+-- AddForeignKey
+ALTER TABLE "organization_invitations" ADD CONSTRAINT "organization_invitations_inviterUserId_fkey" FOREIGN KEY ("inviterUserId") REFERENCES "users"("id") ON DELETE CASCADE ON UPDATE CASCADE;

backend/prisma/migrations/20260505181000_rename_lab_permissions_to_organizations/migration.sql

@@ -0,0 +1,7 @@
+UPDATE "permissions"
+SET "name" = 'TAB_ORGANIZATIONS_READ'
+WHERE "name" = 'TAB_LAB_READ';
+
+UPDATE "permissions"
+SET "name" = 'TAB_ORGANIZATIONS_EDIT'
+WHERE "name" = 'TAB_LAB_EDIT';

backend/prisma/schema.prisma

@@ -21,6 +21,7 @@ model User {
   ownedOrganizations Organization[] @relation("OrganizationOwner")
   sessions           Session[] // 👈 ADD THIS - opposite relation for Session
   sentStaffInvites   StaffInvitation[]
+  sentOrganizationInvitations OrganizationInvitation[]
 
   createdAt DateTime @default(now())
   updatedAt DateTime @updatedAt
@@ -57,6 +58,7 @@ model Organization {
 
   sharedWithMe     OrganizationLink[] @relation("OrganizationB")
   sharedWithOthers OrganizationLink[] @relation("OrganizationA")
+  sentOrganizationInvitations OrganizationInvitation[] @relation("OrganizationInvitationInviter")
   patients         Patient[]
 
   createdAt DateTime @default(now())
@@ -211,6 +213,32 @@ model OrganizationLink {
   @@map("organization_links")
 }
 
+model OrganizationInvitation {
+  id String @id @default(uuid())
+
+  inviterOrganizationId String
+  inviterUserId         String
+
+  invitedOrganizationId   String?
+  invitedOrganizationName String
+  invitedOwnerEmail       String
+  invitedOrganizationType String
+  tokenHash               String   @unique
+  expiresAt               DateTime
+  acceptedAt              DateTime?
+  revokedAt               DateTime?
+
+  inviterOrganization Organization @relation("OrganizationInvitationInviter", fields: [inviterOrganizationId], references: [id], onDelete: Cascade)
+  inviterUser         User         @relation(fields: [inviterUserId], references: [id], onDelete: Cascade)
+
+  createdAt DateTime @default(now())
+  updatedAt DateTime @updatedAt
+
+  @@index([inviterOrganizationId, createdAt])
+  @@index([invitedOwnerEmail, createdAt])
+  @@map("organization_invitations")
+}
+
 model Session {
   id           String   @id @default(uuid())
   userId       String

backend/prisma/seed.ts

@@ -74,8 +74,8 @@ async function main() {
       permissions: ['TAB_STAFF_READ', 'TAB_STAFF_EDIT'],
     },
     {
-      name: 'Labs / Clinics',
-      permissions: ['TAB_LAB_READ', 'TAB_LAB_EDIT'],
+      name: 'Organizations',
+      permissions: ['TAB_ORGANIZATIONS_READ', 'TAB_ORGANIZATIONS_EDIT'],
     },
     {
       name: 'Patients',

backend/src/app.module.ts

@@ -8,6 +8,7 @@ import { AdminModule } from './admin/admin.module';
 import { PrismaModule } from '../prisma/prisma.module'; // ✅
 import { PatientsModule } from './modules/patients/patients.module';
 import { StaffModule } from './modules/staff/staff.module';
+import { OrganizationModule } from './modules/organization/organization.module';
 
 @Module({
   imports: [
@@ -19,6 +20,7 @@ import { StaffModule } from './modules/staff/staff.module';
     AuthModule,
     PatientsModule,
     StaffModule,
+    OrganizationModule,
     AdminModule.forRoot(),
   ],
   controllers: [AppController],

backend/src/common/permissions.ts

@@ -4,8 +4,8 @@ export const ALL_TAB_PERMISSIONS = [
   'TAB_TODAY_EDIT',
   'TAB_STAFF_READ',
   'TAB_STAFF_EDIT',
-  'TAB_LAB_READ',
-  'TAB_LAB_EDIT',
+  'TAB_ORGANIZATIONS_READ',
+  'TAB_ORGANIZATIONS_EDIT',
   'TAB_PATIENTS_READ',
   'TAB_PATIENTS_EDIT',
   'TAB_APPOINTMENTS_READ',
@@ -38,7 +38,7 @@ const EDIT_TO_READ: Record<string, string> = {
   TAB_PATIENTS_EDIT: 'TAB_PATIENTS_READ',
   TAB_APPOINTMENTS_EDIT: 'TAB_APPOINTMENTS_READ',
   TAB_STAFF_EDIT: 'TAB_STAFF_READ',
-  TAB_LAB_EDIT: 'TAB_LAB_READ',
+  TAB_ORGANIZATIONS_EDIT: 'TAB_ORGANIZATIONS_READ',
   TAB_TREATMENT_EDIT: 'TAB_TREATMENT_READ',
   TAB_BILLING_EDIT: 'TAB_BILLING_READ',
   TAB_REPORTS_EDIT: 'TAB_REPORTS_READ',

backend/src/modules/auth/auth.service.ts

@@ -20,8 +20,8 @@ const ALL_PERMISSIONS = [
   'TAB_TODAY_EDIT',
   'TAB_STAFF_READ',
   'TAB_STAFF_EDIT',
-  'TAB_LAB_READ',
-  'TAB_LAB_EDIT',
+  'TAB_ORGANIZATIONS_READ',
+  'TAB_ORGANIZATIONS_EDIT',
   'TAB_PATIENTS_READ',
   'TAB_PATIENTS_EDIT',
   'TAB_APPOINTMENTS_READ',
@@ -37,7 +37,7 @@ const ALL_PERMISSIONS = [
 const READ_ONLY_PERMISSIONS = [
   'TAB_TODAY_READ',
   'TAB_STAFF_READ',
-  'TAB_LAB_READ',
+  'TAB_ORGANIZATIONS_READ',
   'TAB_PATIENTS_READ',
   'TAB_APPOINTMENTS_READ',
   'TAB_TREATMENT_READ',

backend/src/modules/organization/dto/accept-organization-invite.dto.ts

@@ -0,0 +1,19 @@
+import { IsString, MinLength } from 'class-validator';
+
+export class AcceptOrganizationInviteDto {
+  @IsString()
+  @MinLength(1)
+  token: string;
+
+  @IsString()
+  @MinLength(1)
+  organizationName: string;
+
+  @IsString()
+  @MinLength(1)
+  ownerName: string;
+
+  @IsString()
+  @MinLength(8)
+  password: string;
+}

backend/src/modules/organization/dto/create-link-request.dto.ts

@@ -0,0 +1,6 @@
+import { IsUUID } from 'class-validator';
+
+export class CreateLinkRequestDto {
+  @IsUUID()
+  targetOrganizationId: string;
+}

backend/src/modules/organization/dto/invite-organization.dto.ts

@@ -0,0 +1,14 @@
+import { IsEmail, IsOptional, IsString, MinLength } from 'class-validator';
+
+export class InviteOrganizationDto {
+  @IsString()
+  @MinLength(1)
+  organizationName: string;
+
+  @IsEmail()
+  ownerEmail: string;
+
+  @IsOptional()
+  @IsString()
+  phone?: string;
+}

backend/src/modules/organization/dto/preview-organization-invite.dto.ts

@@ -0,0 +1,7 @@
+import { IsString, MinLength } from 'class-validator';
+
+export class PreviewOrganizationInviteDto {
+  @IsString()
+  @MinLength(1)
+  token: string;
+}

backend/src/modules/organization/organization.controller.ts

@@ -0,0 +1,78 @@
+import {
+  Body,
+  Controller,
+  Get,
+  Post,
+  Query,
+  Req,
+  UseGuards,
+} from '@nestjs/common';
+import { ApiBearerAuth, ApiOperation, ApiTags } from '@nestjs/swagger';
+import { JwtAuthGuard } from '../auth/guards/jwt-auth.guard';
+import { AcceptOrganizationInviteDto } from './dto/accept-organization-invite.dto';
+import { CreateLinkRequestDto } from './dto/create-link-request.dto';
+import { InviteOrganizationDto } from './dto/invite-organization.dto';
+import { PreviewOrganizationInviteDto } from './dto/preview-organization-invite.dto';
+import { OrganizationService } from './organization.service';
+
+@ApiTags('organizations')
+@ApiBearerAuth('JWT-auth')
+@Controller('organizations')
+export class OrganizationController {
+  constructor(private readonly organizationService: OrganizationService) {}
+
+  @Get('invitations/preview')
+  @ApiOperation({ summary: 'Preview organization invite by token (public)' })
+  previewInvite(@Query() query: PreviewOrganizationInviteDto) {
+    return this.organizationService.previewInvite(query.token);
+  }
+
+  @Post('invitations/accept')
+  @ApiOperation({ summary: 'Accept organization invite and create/link counterpart org (public)' })
+  acceptInvite(@Body() dto: AcceptOrganizationInviteDto) {
+    return this.organizationService.acceptInvite(dto);
+  }
+
+  @Get('search')
+  @UseGuards(JwtAuthGuard)
+  @ApiOperation({
+    summary: 'Search counterpart organizations (active subscription only)',
+  })
+  search(
+    @Req() req: { user: { id: string; organizationId?: string } },
+    @Query('q') q = '',
+  ) {
+    const organizationId = this.organizationService.getOrganizationIdFromUser(req.user);
+    return this.organizationService.searchCounterpartOrganizations(req.user.id, organizationId, q);
+  }
+
+  @Get('links')
+  @UseGuards(JwtAuthGuard)
+  @ApiOperation({ summary: 'List counterpart links and invitations for current org' })
+  list(@Req() req: { user: { id: string; organizationId?: string } }) {
+    const organizationId = this.organizationService.getOrganizationIdFromUser(req.user);
+    return this.organizationService.list(req.user.id, organizationId);
+  }
+
+  @Post('links')
+  @UseGuards(JwtAuthGuard)
+  @ApiOperation({ summary: 'Create pending link request to an existing subscribed counterpart org' })
+  createLinkRequest(
+    @Req() req: { user: { id: string; organizationId?: string } },
+    @Body() dto: CreateLinkRequestDto,
+  ) {
+    const organizationId = this.organizationService.getOrganizationIdFromUser(req.user);
+    return this.organizationService.createLinkRequest(req.user.id, organizationId, dto);
+  }
+
+  @Post('invite')
+  @UseGuards(JwtAuthGuard)
+  @ApiOperation({ summary: 'Create invite link for owner of not-yet-subscribed counterpart org' })
+  inviteOrganization(
+    @Req() req: { user: { id: string; organizationId?: string } },
+    @Body() dto: InviteOrganizationDto,
+  ) {
+    const organizationId = this.organizationService.getOrganizationIdFromUser(req.user);
+    return this.organizationService.inviteOrganization(req.user.id, organizationId, dto);
+  }
+}

backend/src/modules/organization/organization.module.ts

@@ -0,0 +1,10 @@
+import { Module } from '@nestjs/common';
+import { PrismaService } from '../../../prisma/prisma.service';
+import { OrganizationController } from './organization.controller';
+import { OrganizationService } from './organization.service';
+
+@Module({
+  controllers: [OrganizationController],
+  providers: [OrganizationService, PrismaService],
+})
+export class OrganizationModule {}

backend/src/modules/organization/organization.service.ts

@@ -0,0 +1,451 @@
+import {
+  BadRequestException,
+  ConflictException,
+  ForbiddenException,
+  Injectable,
+  NotFoundException,
+} from '@nestjs/common';
+import { LinkStatus } from '@prisma/client';
+import * as bcrypt from 'bcrypt';
+import { createHash, randomBytes } from 'crypto';
+import { PrismaService } from '../../../prisma/prisma.service';
+import { AcceptOrganizationInviteDto } from './dto/accept-organization-invite.dto';
+import { CreateLinkRequestDto } from './dto/create-link-request.dto';
+import { InviteOrganizationDto } from './dto/invite-organization.dto';
+
+@Injectable()
+export class OrganizationService {
+  constructor(private readonly prisma: PrismaService) {}
+
+  getOrganizationIdFromUser(user: { organizationId?: string }) {
+    if (!user?.organizationId) {
+      throw new BadRequestException('Organization is not selected');
+    }
+    return user.organizationId;
+  }
+
+  async searchCounterpartOrganizations(userId: string, organizationId: string, query: string) {
+    const actor = await this.getActorMembership(userId, organizationId);
+    if (!actor || !this.canEditOrganizations(actor)) {
+      throw new ForbiddenException('You do not have permission to manage organizations');
+    }
+
+    const targetType = this.getCounterpartType(actor.organization.type.name);
+    const q = query.trim();
+
+    const organizations = await this.prisma.organization.findMany({
+      where: {
+        type: { name: targetType },
+        planId: { not: null },
+        ...(q
+          ? {
+              OR: [
+                { name: { contains: q, mode: 'insensitive' } },
+                { email: { contains: q, mode: 'insensitive' } },
+                { phone: { contains: q, mode: 'insensitive' } },
+              ],
+            }
+          : {}),
+      },
+      select: {
+        id: true,
+        name: true,
+        email: true,
+        phone: true,
+        owner: { select: { email: true, name: true } },
+      },
+      orderBy: { name: 'asc' },
+      take: 25,
+    });
+
+    return { success: true, data: organizations };
+  }
+
+  async list(userId: string, organizationId: string) {
+    const actor = await this.getActorMembership(userId, organizationId);
+    if (!actor || !this.canEditOrganizations(actor)) {
+      throw new ForbiddenException('You do not have permission to manage organizations');
+    }
+
+    const [linksA, linksB, invitations] = await Promise.all([
+      this.prisma.organizationLink.findMany({
+        where: { organizationAId: organizationId },
+        include: {
+          organizationB: { select: { id: true, name: true, email: true, phone: true, type: true } },
+        },
+        orderBy: { createdAt: 'desc' },
+      }),
+      this.prisma.organizationLink.findMany({
+        where: { organizationBId: organizationId },
+        include: {
+          organizationA: { select: { id: true, name: true, email: true, phone: true, type: true } },
+        },
+        orderBy: { createdAt: 'desc' },
+      }),
+      this.prisma.organizationInvitation.findMany({
+        where: { inviterOrganizationId: organizationId },
+        orderBy: { createdAt: 'desc' },
+      }),
+    ]);
+
+    const linkItems = [
+      ...linksA.map((l) => ({
+        id: l.id,
+        kind: 'LINK' as const,
+        counterpartOrganizationId: l.organizationB.id,
+        organizationName: l.organizationB.name,
+        ownerEmail: l.organizationB.email,
+        phone: l.organizationB.phone,
+        status: l.status,
+        invitationUrl: null as string | null,
+        createdAt: l.createdAt.toISOString(),
+        acceptedAt: l.status === LinkStatus.ACTIVE ? l.updatedAt.toISOString() : null,
+      })),
+      ...linksB.map((l) => ({
+        id: l.id,
+        kind: 'LINK' as const,
+        counterpartOrganizationId: l.organizationA.id,
+        organizationName: l.organizationA.name,
+        ownerEmail: l.organizationA.email,
+        phone: l.organizationA.phone,
+        status: l.status,
+        invitationUrl: null as string | null,
+        createdAt: l.createdAt.toISOString(),
+        acceptedAt: l.status === LinkStatus.ACTIVE ? l.updatedAt.toISOString() : null,
+      })),
+    ];
+
+    const inviteItems = invitations.map((i) => ({
+      id: i.id,
+      kind: 'INVITATION' as const,
+      counterpartOrganizationId: i.invitedOrganizationId,
+      organizationName: i.invitedOrganizationName,
+      ownerEmail: i.invitedOwnerEmail,
+      phone: null as string | null,
+      status: this.mapInvitationStatus(i.acceptedAt, i.revokedAt, i.expiresAt),
+      invitationUrl:
+        !i.acceptedAt && !i.revokedAt && i.expiresAt.getTime() > Date.now()
+          ? this.buildInviteUrlFromTokenHashPlaceholder()
+          : null,
+      createdAt: i.createdAt.toISOString(),
+      acceptedAt: i.acceptedAt?.toISOString() ?? null,
+    }));
+
+    return {
+      success: true,
+      data: {
+        items: [...linkItems, ...inviteItems].sort((a, b) =>
+          a.createdAt < b.createdAt ? 1 : -1,
+        ),
+      },
+    };
+  }
+
+  async createLinkRequest(userId: string, organizationId: string, dto: CreateLinkRequestDto) {
+    const actor = await this.getActorMembership(userId, organizationId);
+    if (!actor || !this.canEditOrganizations(actor)) {
+      throw new ForbiddenException('You do not have permission to manage organizations');
+    }
+    if (dto.targetOrganizationId === organizationId) {
+      throw new BadRequestException('You cannot link organization to itself');
+    }
+
+    const sourceType = actor.organization.type.name;
+    const targetType = this.getCounterpartType(sourceType);
+    const target = await this.prisma.organization.findUnique({
+      where: { id: dto.targetOrganizationId },
+      select: { id: true, type: true, planId: true },
+    });
+    if (!target) {
+      throw new NotFoundException('Organization not found');
+    }
+    if (target.type.name !== targetType) {
+      throw new BadRequestException(`You can only link to ${targetType} organizations`);
+    }
+    if (!target.planId) {
+      throw new BadRequestException('Target organization does not have an active subscription');
+    }
+
+    const [aId, bId] =
+      organizationId < dto.targetOrganizationId
+        ? [organizationId, dto.targetOrganizationId]
+        : [dto.targetOrganizationId, organizationId];
+
+    const existing = await this.prisma.organizationLink.findUnique({
+      where: { organizationAId_organizationBId: { organizationAId: aId, organizationBId: bId } },
+    });
+    if (existing) {
+      throw new ConflictException('Link already exists for these organizations');
+    }
+
+    const created = await this.prisma.organizationLink.create({
+      data: {
+        organizationAId: aId,
+        organizationBId: bId,
+        status: LinkStatus.PENDING,
+        sharedDataTypes: [],
+      },
+    });
+
+    return {
+      success: true,
+      data: { id: created.id, status: created.status },
+      message: 'Link request created',
+    };
+  }
+
+  async inviteOrganization(userId: string, organizationId: string, dto: InviteOrganizationDto) {
+    const actor = await this.getActorMembership(userId, organizationId);
+    if (!actor || !this.canEditOrganizations(actor)) {
+      throw new ForbiddenException('You do not have permission to manage organizations');
+    }
+
+    const ownerEmail = dto.ownerEmail.trim().toLowerCase();
+    const inviterType = actor.organization.type.name;
+    const invitedType = this.getCounterpartType(inviterType);
+    const plainToken = this.generateInviteToken();
+    const tokenHash = this.hashInviteToken(plainToken);
+
+    const existingOwnerWithPlan = await this.prisma.organization.findFirst({
+      where: {
+        owner: { email: ownerEmail },
+        planId: { not: null },
+      },
+      select: { id: true },
+    });
+    if (existingOwnerWithPlan) {
+      throw new BadRequestException(
+        'This owner already has an organization with active subscription. Select that organization from search instead of sending invitation.',
+      );
+    }
+
+    const invitedOrg = await this.prisma.organization.findFirst({
+      where: {
+        owner: { email: ownerEmail },
+        type: { name: invitedType },
+      },
+      select: { id: true, name: true },
+      orderBy: { createdAt: 'desc' },
+    });
+
+    const invitation = await this.prisma.organizationInvitation.create({
+      data: {
+        inviterOrganizationId: organizationId,
+        inviterUserId: userId,
+        invitedOrganizationId: invitedOrg?.id ?? null,
+        invitedOrganizationName: dto.organizationName.trim(),
+        invitedOwnerEmail: ownerEmail,
+        invitedOrganizationType: invitedType,
+        tokenHash,
+        expiresAt: this.getInviteExpiryDate(),
+      },
+    });
+
+    return {
+      success: true,
+      data: {
+        invitationId: invitation.id,
+        invitationUrl: this.buildInviteUrl(plainToken),
+        status: 'PENDING',
+      },
+    };
+  }
+
+  async previewInvite(token: string) {
+    const invitation = await this.findValidInvitation(token);
+    return {
+      success: true,
+      data: {
+        ownerEmail: invitation.invitedOwnerEmail,
+        organizationName: invitation.invitedOrganizationName,
+        organizationType: invitation.invitedOrganizationType,
+        inviterOrganizationName: invitation.inviterOrganization.name,
+        expiresAt: invitation.expiresAt.toISOString(),
+        status: invitation.acceptedAt ? 'ACCEPTED' : 'PENDING',
+      },
+    };
+  }
+
+  async acceptInvite(dto: AcceptOrganizationInviteDto) {
+    const invitation = await this.findValidInvitation(dto.token);
+    if (invitation.acceptedAt) {
+      throw new BadRequestException('This invitation has already been accepted');
+    }
+
+    const organization = await this.prisma.$transaction(async (tx) => {
+      const passwordHash = await bcrypt.hash(dto.password, 10);
+      const ownerEmail = invitation.invitedOwnerEmail;
+
+      let owner = await tx.user.findUnique({ where: { email: ownerEmail } });
+      if (!owner) {
+        owner = await tx.user.create({
+          data: {
+            email: ownerEmail,
+            name: dto.ownerName.trim(),
+            passwordHash,
+            trialUsedAt: new Date(),
+          },
+        });
+      } else if (!owner.passwordHash) {
+        owner = await tx.user.update({
+          where: { id: owner.id },
+          data: { passwordHash, name: dto.ownerName.trim(), trialUsedAt: owner.trialUsedAt ?? new Date() },
+        });
+      }
+
+      let targetOrganizationId = invitation.invitedOrganizationId;
+      if (targetOrganizationId) {
+        await tx.organization.update({
+          where: { id: targetOrganizationId },
+          data: {
+            name: dto.organizationName.trim(),
+            email: ownerEmail,
+            owner: { connect: { id: owner.id } },
+            plan: { connect: { name: 'trial' } },
+          },
+        });
+      } else {
+        const createdOrg = await tx.organization.create({
+          data: {
+            name: dto.organizationName.trim(),
+            email: ownerEmail,
+            owner: { connect: { id: owner.id } },
+            type: { connect: { name: invitation.invitedOrganizationType } },
+            plan: { connect: { name: 'trial' } },
+          },
+        });
+        targetOrganizationId = createdOrg.id;
+      }
+
+      const ownerMembership = await tx.membership.findFirst({
+        where: { userId: owner.id, organizationId: targetOrganizationId },
+        select: { id: true },
+      });
+      if (!ownerMembership) {
+        await tx.membership.create({
+          data: {
+            userId: owner.id,
+            organizationId: targetOrganizationId,
+            isOwner: true,
+            isActive: true,
+          },
+        });
+      }
+
+      const [aId, bId] =
+        invitation.inviterOrganizationId < targetOrganizationId
+          ? [invitation.inviterOrganizationId, targetOrganizationId]
+          : [targetOrganizationId, invitation.inviterOrganizationId];
+
+      await tx.organizationLink.upsert({
+        where: { organizationAId_organizationBId: { organizationAId: aId, organizationBId: bId } },
+        update: { status: LinkStatus.ACTIVE },
+        create: {
+          organizationAId: aId,
+          organizationBId: bId,
+          status: LinkStatus.ACTIVE,
+          sharedDataTypes: [],
+        },
+      });
+
+      await tx.organizationInvitation.update({
+        where: { id: invitation.id },
+        data: {
+          acceptedAt: new Date(),
+          invitedOrganizationId: targetOrganizationId,
+          invitedOrganizationName: dto.organizationName.trim(),
+        },
+      });
+
+      return targetOrganizationId;
+    });
+
+    return {
+      success: true,
+      data: { organizationId: organization },
+      message: 'Invitation accepted. Organization trial has started and link is active.',
+    };
+  }
+
+  private async getActorMembership(userId: string, organizationId: string) {
+    return this.prisma.membership.findFirst({
+      where: { userId, organizationId },
+      include: {
+        organization: {
+          select: {
+            id: true,
+            type: true,
+          },
+        },
+        permissions: { include: { permission: true } },
+      },
+    });
+  }
+
+  private canEditOrganizations(m: {
+    isOwner: boolean;
+    permissions: { permission: { name: string } }[];
+  }): boolean {
+    if (m.isOwner) return true;
+    return m.permissions.some((p) => p.permission.name === 'TAB_ORGANIZATIONS_EDIT');
+  }
+
+  private getCounterpartType(orgType: string): 'CLINIC' | 'LAB' {
+    if (orgType === 'CLINIC') return 'LAB';
+    if (orgType === 'LAB') return 'CLINIC';
+    throw new BadRequestException('Unknown organization type');
+  }
+
+  private mapInvitationStatus(
+    acceptedAt: Date | null,
+    revokedAt: Date | null,
+    expiresAt: Date,
+  ): LinkStatus | 'EXPIRED' {
+    if (acceptedAt) return LinkStatus.ACTIVE;
+    if (revokedAt) return LinkStatus.REJECTED;
+    return expiresAt.getTime() > Date.now() ? LinkStatus.PENDING : 'EXPIRED';
+  }
+
+  private generateInviteToken(): string {
+    return randomBytes(32).toString('hex');
+  }
+
+  private hashInviteToken(token: string): string {
+    return createHash('sha256').update(token).digest('hex');
+  }
+
+  private getInviteExpiryDate(): Date {
+    const d = new Date();
+    d.setDate(d.getDate() + 7);
+    return d;
+  }
+
+  private buildInviteUrl(token: string): string {
+    const appUrl = process.env.FRONTEND_URL || 'http://localhost:3001';
+    return `${appUrl}/accept-organization-invite?token=${encodeURIComponent(token)}`;
+  }
+
+  private buildInviteUrlFromTokenHashPlaceholder(): null {
+    // Raw token cannot be reconstructed from hash, so pending links are preserved client-side after creation.
+    return null;
+  }
+
+  private async findValidInvitation(token: string) {
+    const invitation = await this.prisma.organizationInvitation.findUnique({
+      where: { tokenHash: this.hashInviteToken(token) },
+      include: {
+        inviterOrganization: { select: { id: true, name: true } },
+      },
+    });
+    if (!invitation) {
+      throw new NotFoundException('Invitation not found');
+    }
+    if (invitation.revokedAt) {
+      throw new BadRequestException('Invitation has been revoked');
+    }
+    if (invitation.expiresAt.getTime() <= Date.now()) {
+      throw new BadRequestException('Invitation has expired');
+    }
+    return invitation;
+  }
+}