From 94be40b899aad3736b991a88381028523c0d302a Mon Sep 17 00:00:00 2001
From: Andrew Hampton <andrewwh@gmail.com>
Date: Fri, 6 Mar 2026 11:47:14 -0500
Subject: [PATCH] feat(user-management): add invitation accept endpoint

---
 lib/workos/user_management.rb           | 16 ++++++
 spec/lib/workos/user_management_spec.rb | 75 +++++++++++++++++++++++++
 2 files changed, 91 insertions(+)

diff --git a/lib/workos/user_management.rb b/lib/workos/user_management.rb
index cd362005..7cfbe96c 100644
--- a/lib/workos/user_management.rb
+++ b/lib/workos/user_management.rb
@@ -1172,6 +1172,22 @@ def send_invitation(email:, organization_id: nil, expires_in_days: nil, inviter_
         WorkOS::Invitation.new(response.body)
       end
 
+      # Accepts an existing Invitation.
+      #
+      # @param [String] id The unique ID of the Invitation.
+      #
+      # @return WorkOS::Invitation
+      def accept_invitation(id:)
+        request = post_request(
+          path: "/user_management/invitations/#{id}/accept",
+          auth: true,
+        )
+
+        response = execute_request(request: request)
+
+        WorkOS::Invitation.new(response.body)
+      end
+
       # Revokes an existing Invitation.
       #
       # @param [String] id The unique ID of the Invitation.
diff --git a/spec/lib/workos/user_management_spec.rb b/spec/lib/workos/user_management_spec.rb
index 2cdbc4e7..b9485f9c 100644
--- a/spec/lib/workos/user_management_spec.rb
+++ b/spec/lib/workos/user_management_spec.rb
@@ -1728,6 +1728,81 @@
     end
   end
 
+  describe '.accept_invitation' do
+    context 'with a valid id' do
+      it 'accepts invitation' do
+        expect(described_class).to receive(:post_request) do |options|
+          expect(options[:path]).to eq('/user_management/invitations/invitation_123/accept')
+          expect(options[:auth]).to be true
+
+          double('request')
+        end.and_return(double('request'))
+
+        response_body = {
+          id: 'invitation_123',
+          email: 'test@workos.com',
+          state: 'accepted',
+        }.to_json
+
+        expect(described_class).to receive(:execute_request).and_return(
+          double('response', body: response_body),
+        )
+
+        invitation = described_class.accept_invitation(
+          id: 'invitation_123',
+        )
+
+        expect(invitation.id).to eq('invitation_123')
+        expect(invitation.email).to eq('test@workos.com')
+        expect(invitation.state).to eq('accepted')
+      end
+    end
+
+    context 'with an invalid id' do
+      it 'returns an error' do
+        expect(described_class).to receive(:post_request) do |options|
+          expect(options[:path]).to eq('/user_management/invitations/invalid_id/accept')
+          expect(options[:auth]).to be true
+
+          double('request')
+        end.and_return(double('request'))
+
+        expect(described_class).to receive(:execute_request).and_raise(
+          WorkOS::NotFoundError.new(message: 'Invitation not found'),
+        )
+
+        expect do
+          described_class.accept_invitation(id: 'invalid_id')
+        end.to raise_error(
+          WorkOS::NotFoundError,
+          /Invitation not found/,
+        )
+      end
+    end
+
+    context 'when invitation has already been accepted' do
+      it 'returns an error' do
+        expect(described_class).to receive(:post_request) do |options|
+          expect(options[:path]).to eq('/user_management/invitations/invitation_123/accept')
+          expect(options[:auth]).to be true
+
+          double('request')
+        end.and_return(double('request'))
+
+        expect(described_class).to receive(:execute_request).and_raise(
+          WorkOS::InvalidRequestError.new(message: 'Invite has already been accepted'),
+        )
+
+        expect do
+          described_class.accept_invitation(id: 'invitation_123')
+        end.to raise_error(
+          WorkOS::InvalidRequestError,
+          /Invite has already been accepted/,
+        )
+      end
+    end
+  end
+
   describe '.revoke_invitation' do
     context 'with valid payload' do
       it 'revokes invitation' do