Apps Run The World

Pfizer Software Purchases and Digital Transformation Initiatives

Discover the latest software purchases and digital transformation initiatives being undertaken by Pfizer and its business and technology executives. Each quarter our research team identifies on-prem and cloud applications that are being used by the 78500 Pfizer employees from the public (Press Releases, Customer References, Testimonials, Case Studies and Success Stories) and proprietary sources.

During our research, we have identified that Pfizer has purchased the following applications: SAP Portfolio and Project Management for Project Portfolio Management in 2015, Salesforce Service Cloud for Customer Support in 2017, MicroStrategy Platform Analytics for Analytics and BI in 2015 and the related IT decision-makers and key stakeholders.

Our database provides customer insight and contextual information on which enterprise applications and software systems Pfizer is running and its propensity to invest more and deepen its relationship with SAP , Salesforce , MicroStrategy or identify new suppliers as part of their overall Digital and IT transformation projects to stay competitive, fend off threats from disruptive forces, or comply with internal mandates to improve overall enterprise efficiency.

We have been analyzing Pfizer revenues, which have grown to $41.91 billion in 2021, plus its IT budget and roadmap, cloud software purchases, aggregating massive amounts of data points that form the basis of our forecast assumptions for Pfizer intention to invest in emerging technologies such as AI, Machine Learning, IoT, Blockchain, Autonomous Database or in cloud-based ERP, HCM, CRM, EPM, Procurement or Treasury applications.


Pfizer Inc
235 East 42nd Street
New York, 10017 , NY
United States
1 212-733-2323
https://www.pfizer.com/
Industry Employees Revenue
Life Sciences 78500 $41.91B

Enterprise Software and Cloud Applications being used by Pfizer


Vendor Old Product New Product Category Market Users VAR/SI When Live
IBM Legacy Applications IBM Netezza Data Warehouse Data Warehouse Analytics and BI n/a n/a 2019 2019
Subscribe Subscribe Subscribe Analytics and BI Analytics and BI Subscribe Subscribe 2016 2016
Subscribe Subscribe Subscribe Analytics and BI Analytics and BI Subscribe Subscribe 2015 2018
Subscribe Subscribe Subscribe Analytics and BI Analytics and BI Subscribe Subscribe 2011 2011
Subscribe Subscribe Subscribe Analytics and BI Analytics and BI Subscribe Subscribe 2017 2017
Subscribe Subscribe Subscribe Analytics and BI Analytics and BI Subscribe Subscribe 2015 2015
Subscribe Subscribe Subscribe Intelligent Process Automation Artificial Intelligence Subscribe Subscribe 2016 2017
Subscribe Subscribe Subscribe Chatbots and Conversational AI Artificial Intelligence Subscribe Subscribe 2020 2020
Subscribe Subscribe Subscribe Blockchain Platform Blockchain Subscribe Subscribe 2018 2018
Subscribe Subscribe Subscribe Audio Video and Web Conferencing Collaboration Subscribe Subscribe 2017 2017
Subscribe Subscribe Subscribe Event Management Collaboration Subscribe Subscribe 2019 2019
Subscribe Subscribe Subscribe Audio Video and Web Conferencing Collaboration Subscribe Subscribe 2020 2020
Subscribe Subscribe Subscribe Digital Signing Content Management Subscribe Subscribe 2021 2021
Subscribe Subscribe Subscribe Web Content Management Content Management Subscribe Subscribe 2020 2020
Subscribe Subscribe Subscribe Tag Management CRM Subscribe Subscribe 2020 2020
Subscribe Subscribe Subscribe Marketing Automation CRM Subscribe Subscribe 2020 2020
Subscribe Subscribe Subscribe Marketing Automation CRM Subscribe Subscribe 2020 2020
Subscribe Subscribe Subscribe Marketing Automation CRM Subscribe Subscribe 2015 2015
Subscribe Subscribe Subscribe Sales Automation,CRM,Sales Engagement CRM Subscribe Subscribe 2012 2013
Subscribe Subscribe Subscribe Customer Support CRM Subscribe Subscribe 2017 2018
Subscribe Subscribe Subscribe Customer Experience CRM Subscribe Subscribe 2020 2020
Subscribe Subscribe Subscribe Account Based Marketing CRM Subscribe Subscribe 2015 2015
Subscribe Subscribe Subscribe Marketing Automation CRM Subscribe Subscribe 2012 2013
Subscribe Subscribe Subscribe Marketing Analytics CRM Subscribe Subscribe 2020 2020
Subscribe Subscribe Subscribe Marketing Automation CRM Subscribe Subscribe 2018 2019
Subscribe Subscribe Subscribe CRM CRM Subscribe Subscribe 2015 2015
Subscribe Subscribe Subscribe CRM CRM Subscribe Subscribe 2017 2017
Subscribe Subscribe Subscribe Customer Engagement CRM Subscribe Subscribe 2016 2016
Subscribe Subscribe Subscribe Customer Engagement CRM Subscribe Subscribe 2020 2020
Subscribe Subscribe Subscribe Shipping Management eCommerce Subscribe Subscribe 2021 2021
Subscribe Subscribe Subscribe EPM EPM Subscribe Subscribe 2010 2010
Subscribe Subscribe Subscribe ERP Financial ERP Financial Management Subscribe Subscribe 2006 2007
Subscribe Subscribe Subscribe ERP Financial ERP Financial Management Subscribe Subscribe 2021 2021
Subscribe Subscribe Subscribe Expense Management ERP Financial Management Subscribe Subscribe 2016 2017
Subscribe Subscribe Subscribe AR Automation ERP Financial Management Subscribe Subscribe 2007 2007
Subscribe Subscribe Subscribe AP Automation ERP Financial Management Subscribe Subscribe 2018 2018
Subscribe Subscribe Subscribe Case Management ERP Services and Operations Subscribe Subscribe 2010 2010
Subscribe Subscribe Subscribe Lease Management ERP Services and Operations Subscribe Subscribe 2017 2017
Subscribe Subscribe Subscribe Travel Management ERP Services and Operations Subscribe Subscribe 2009 2009
Subscribe Subscribe Subscribe Compensation Management HCM Subscribe Subscribe 2017 2018
Subscribe Subscribe Subscribe Onboarding HCM Subscribe Subscribe 2017 2017
Subscribe Subscribe Subscribe Video Interviewing HCM Subscribe Subscribe 2017 2017
Subscribe Subscribe Subscribe Recruiting HCM Subscribe Subscribe 2019 2019
Subscribe Subscribe Subscribe Employee Engagement HCM Subscribe Subscribe 2009 2009
Subscribe Subscribe Subscribe Employee Experience HCM Subscribe Subscribe 2019 2019
Subscribe Subscribe Subscribe Employee Recognition and Rewards Management HCM Subscribe Subscribe 2018 2018
Subscribe Subscribe Subscribe Performance and Goal Management HCM Subscribe Subscribe 2017 2017
Subscribe Subscribe Subscribe Compliance HCM Subscribe Subscribe 2015 2015
Subscribe Subscribe Subscribe Compliance HCM Subscribe Subscribe 2010 2010
Subscribe Subscribe Subscribe Core HR HCM Subscribe Subscribe 2017 2018
Subscribe Subscribe Subscribe Recruiting,Applicant Tracking System HCM Subscribe Subscribe 2015 2015
Subscribe Subscribe Subscribe Workforce Management HCM Subscribe Subscribe 2007 2008
Subscribe Subscribe Subscribe Time and Attendance HCM Subscribe Subscribe 2007 2008
Subscribe Subscribe Subscribe Learning and Development HCM Subscribe Subscribe 2012 2013
Subscribe Subscribe Subscribe Workforce Analytics HCM Subscribe Subscribe 2017 2017
Subscribe Subscribe Subscribe Compliance HCM Subscribe Subscribe 2010 2010
Subscribe Subscribe Subscribe Learning and Development HCM Subscribe Subscribe 2015 2015
Subscribe Subscribe Subscribe Learning and Development HCM Subscribe Subscribe 2018 2018
Subscribe Subscribe Subscribe Payroll HCM Subscribe Subscribe 2017 2018
Subscribe Subscribe Subscribe Onboarding HCM Subscribe Subscribe 2018 2018
Subscribe Subscribe Subscribe HR Service Delivery HCM Subscribe Subscribe 2017 2018
Subscribe Subscribe Subscribe Benefits Administration HCM Subscribe Subscribe 2017 2018
Subscribe Subscribe Subscribe Absence and Leave Management HCM Subscribe Subscribe 2007 2008
Subscribe Subscribe Subscribe Data Warehouse Appliance IaaS Subscribe Subscribe 2019 2019
Subscribe Subscribe Subscribe Digital Workspace IaaS Subscribe Subscribe 2018 2018
Subscribe Subscribe Subscribe Content Delivery Network IaaS Subscribe Subscribe 2021 2021
Subscribe Subscribe Subscribe Cloud Storage IaaS Subscribe Subscribe 2015 2015
Subscribe Subscribe Subscribe Content Delivery Network IaaS Subscribe Subscribe 2018 2018
Subscribe Subscribe Subscribe Secure Email Gateways (SEGs) IaaS Subscribe Subscribe 2012 2012
Subscribe Subscribe Subscribe Application Hosting and Computing Services IaaS Subscribe Subscribe 2014 2014
Subscribe Subscribe Subscribe Application Hosting and Computing Services IaaS Subscribe Subscribe 2014 2014
Subscribe Subscribe Subscribe Application Performance Management ITSM Subscribe Subscribe 2013 2013
Subscribe Subscribe Subscribe IT Service Management ITSM Subscribe Subscribe 2018 2019
Subscribe Subscribe Subscribe Incident Management ITSM Subscribe Subscribe 2017 2017
Subscribe Subscribe Subscribe Database Management PaaS Subscribe Subscribe 2020 2020
Subscribe Subscribe Subscribe Transactional Email PaaS Subscribe Subscribe 2018 2018
Subscribe Subscribe Subscribe Database Management PaaS Subscribe Subscribe 2015 2015
Subscribe Subscribe Subscribe Transactional Email PaaS Subscribe Subscribe 2015 2015
Subscribe Subscribe Subscribe Intellectual Property Management PLM and Engineering Subscribe Subscribe 2019 2019
Subscribe Subscribe Subscribe Project Portfolio Management PPM Subscribe Subscribe 2015 2015
Subscribe Subscribe Subscribe Sourcing Procurement Subscribe Subscribe 2004 2005
Subscribe Subscribe Subscribe Procurement Procurement Subscribe Subscribe 2004 2005
Subscribe Subscribe Subscribe Supplier Relationship Management Procurement Subscribe Subscribe 2004 2004
Subscribe Subscribe Subscribe Warehouse Management SCM Subscribe Subscribe 2011 2011
Subscribe Subscribe Subscribe Supply Chain Management SCM Subscribe Subscribe 2014 2015
Subscribe Subscribe Subscribe Demand Forecasting and Planning,Advanced Planning and Scheduling SCM Subscribe Subscribe 2016 2016
Subscribe Subscribe Subscribe Supply Chain Management SCM Subscribe Subscribe 2012 2012
Subscribe Subscribe Subscribe Real-Time Transportation Visibility SCM Subscribe Subscribe 2020 2020
Subscribe Subscribe Subscribe Incentive Compensation Management SPM Subscribe Subscribe 2012 2012
Subscribe Subscribe Subscribe Configure Price Quote (CPQ) SPM Subscribe Subscribe 2016 2016
Subscribe Subscribe Subscribe Treasury Management TRM Subscribe Subscribe 2015 2015
Subscribe Subscribe Subscribe Whistleblowing Management TRM Subscribe Subscribe 2018 2018
Vendor Old Product New Product Category Market Users VAR/SI When Live
IBM Legacy Applications IBM Netezza Data Warehouse Data Warehouse Analytics and BI n/a n/a 2019 2019
Subscribe Subscribe Subscribe Analytics and BI Analytics and BI Subscribe Subscribe 2016 2016
Subscribe Subscribe Subscribe Analytics and BI Analytics and BI Subscribe Subscribe 2015 2018
Subscribe Subscribe Subscribe Analytics and BI Analytics and BI Subscribe Subscribe 2011 2011
Subscribe Subscribe Subscribe Analytics and BI Analytics and BI Subscribe Subscribe 2015 2015
Subscribe Subscribe Subscribe Analytics and BI Analytics and BI Subscribe Subscribe 2017 2017
Subscribe Subscribe Subscribe Audio Video and Web Conferencing Collaboration Subscribe Subscribe 2017 2017
Subscribe Subscribe Subscribe Event Management Collaboration Subscribe Subscribe 2019 2019
Subscribe Subscribe Subscribe Audio Video and Web Conferencing Collaboration Subscribe Subscribe 2020 2020
Subscribe Subscribe Subscribe Digital Signing Content Management Subscribe Subscribe 2021 2021
Subscribe Subscribe Subscribe Web Content Management Content Management Subscribe Subscribe 2020 2020
Subscribe Subscribe Subscribe Account Based Marketing CRM Subscribe Subscribe 2015 2015
Subscribe Subscribe Subscribe Customer Engagement CRM Subscribe Subscribe 2020 2020
Subscribe Subscribe Subscribe Marketing Automation CRM Subscribe Subscribe 2020 2020
Subscribe Subscribe Subscribe Marketing Automation CRM Subscribe Subscribe 2015 2015
Subscribe Subscribe Subscribe Sales Automation,CRM,Sales Engagement CRM Subscribe Subscribe 2012 2013
Subscribe Subscribe Subscribe CRM CRM Subscribe Subscribe 2015 2015
Subscribe Subscribe Subscribe Customer Engagement CRM Subscribe Subscribe 2016 2016
Subscribe Subscribe Subscribe Customer Support CRM Subscribe Subscribe 2017 2018
Subscribe Subscribe Subscribe Marketing Automation CRM Subscribe Subscribe 2018 2019
Subscribe Subscribe Subscribe Marketing Analytics CRM Subscribe Subscribe 2020 2020
Subscribe Subscribe Subscribe Marketing Automation CRM Subscribe Subscribe 2020 2020
Subscribe Subscribe Subscribe Customer Experience CRM Subscribe Subscribe 2020 2020
Subscribe Subscribe Subscribe CRM CRM Subscribe Subscribe 2017 2017
Subscribe Subscribe Subscribe Marketing Automation CRM Subscribe Subscribe 2012 2013
Subscribe Subscribe Subscribe Tag Management CRM Subscribe Subscribe 2020 2020
Subscribe Subscribe Subscribe Shipping Management eCommerce Subscribe Subscribe 2021 2021
Subscribe Subscribe Subscribe EPM EPM Subscribe Subscribe 2010 2010
Subscribe Subscribe Subscribe ERP Financial ERP Financial Management Subscribe Subscribe 2021 2021
Subscribe Subscribe Subscribe Expense Management ERP Financial Management Subscribe Subscribe 2016 2017
Subscribe Subscribe Subscribe ERP Financial ERP Financial Management Subscribe Subscribe 2006 2007
Subscribe Subscribe Subscribe AR Automation ERP Financial Management Subscribe Subscribe 2007 2007
Subscribe Subscribe Subscribe AP Automation ERP Financial Management Subscribe Subscribe 2018 2018
Subscribe Subscribe Subscribe Lease Management ERP Services and Operations Subscribe Subscribe 2017 2017
Subscribe Subscribe Subscribe Travel Management ERP Services and Operations Subscribe Subscribe 2009 2009
Subscribe Subscribe Subscribe Case Management ERP Services and Operations Subscribe Subscribe 2010 2010
Subscribe Subscribe Subscribe Benefits Administration HCM Subscribe Subscribe 2017 2018
Subscribe Subscribe Subscribe Employee Recognition and Rewards Management HCM Subscribe Subscribe 2018 2018
Subscribe Subscribe Subscribe Compliance HCM Subscribe Subscribe 2010 2010
Subscribe Subscribe Subscribe Compliance HCM Subscribe Subscribe 2010 2010
Subscribe Subscribe Subscribe Workforce Analytics HCM Subscribe Subscribe 2017 2017
Subscribe Subscribe Subscribe Performance and Goal Management HCM Subscribe Subscribe 2017 2017
Subscribe Subscribe Subscribe HR Service Delivery HCM Subscribe Subscribe 2017 2018
Subscribe Subscribe Subscribe Learning and Development HCM Subscribe Subscribe 2012 2013
Subscribe Subscribe Subscribe Payroll HCM Subscribe Subscribe 2017 2018
Subscribe Subscribe Subscribe Core HR HCM Subscribe Subscribe 2017 2018
Subscribe Subscribe Subscribe Compensation Management HCM Subscribe Subscribe 2017 2018
Subscribe Subscribe Subscribe Absence and Leave Management HCM Subscribe Subscribe 2007 2008
Subscribe Subscribe Subscribe Onboarding HCM Subscribe Subscribe 2018 2018
Subscribe Subscribe Subscribe Time and Attendance HCM Subscribe Subscribe 2007 2008
Subscribe Subscribe Subscribe Onboarding HCM Subscribe Subscribe 2017 2017
Subscribe Subscribe Subscribe Compliance HCM Subscribe Subscribe 2015 2015
Subscribe Subscribe Subscribe Recruiting HCM Subscribe Subscribe 2019 2019
Subscribe Subscribe Subscribe Employee Engagement HCM Subscribe Subscribe 2009 2009
Subscribe Subscribe Subscribe Employee Experience HCM Subscribe Subscribe 2019 2019
Subscribe Subscribe Subscribe Learning and Development HCM Subscribe Subscribe 2015 2015
Subscribe Subscribe Subscribe Learning and Development HCM Subscribe Subscribe 2018 2018
Subscribe Subscribe Subscribe Workforce Management HCM Subscribe Subscribe 2007 2008
Subscribe Subscribe Subscribe Recruiting,Applicant Tracking System HCM Subscribe Subscribe 2015 2015
Subscribe Subscribe Subscribe Video Interviewing HCM Subscribe Subscribe 2017 2017
Subscribe Subscribe Subscribe Incident Management ITSM Subscribe Subscribe 2017 2017
Subscribe Subscribe Subscribe IT Service Management ITSM Subscribe Subscribe 2018 2019
Subscribe Subscribe Subscribe Application Performance Management ITSM Subscribe Subscribe 2013 2013
Subscribe Subscribe Subscribe Intellectual Property Management PLM and Engineering Subscribe Subscribe 2019 2019
Subscribe Subscribe Subscribe Project Portfolio Management PPM Subscribe Subscribe 2015 2015
Subscribe Subscribe Subscribe Supplier Relationship Management Procurement Subscribe Subscribe 2004 2004
Subscribe Subscribe Subscribe Procurement Procurement Subscribe Subscribe 2004 2005
Subscribe Subscribe Subscribe Sourcing Procurement Subscribe Subscribe 2004 2005
Subscribe Subscribe Subscribe Real-Time Transportation Visibility SCM Subscribe Subscribe 2020 2020
Subscribe Subscribe Subscribe Warehouse Management SCM Subscribe Subscribe 2011 2011
Subscribe Subscribe Subscribe Supply Chain Management SCM Subscribe Subscribe 2014 2015
Subscribe Subscribe Subscribe Supply Chain Management SCM Subscribe Subscribe 2012 2012
Subscribe Subscribe Subscribe Demand Forecasting and Planning,Advanced Planning and Scheduling SCM Subscribe Subscribe 2016 2016
Subscribe Subscribe Subscribe Configure Price Quote (CPQ) SPM Subscribe Subscribe 2016 2016
Subscribe Subscribe Subscribe Incentive Compensation Management SPM Subscribe Subscribe 2012 2012
Subscribe Subscribe Subscribe Treasury Management TRM Subscribe Subscribe 2015 2015
Subscribe Subscribe Subscribe Whistleblowing Management TRM Subscribe Subscribe 2018 2018
Vendor Old Product New Product Category Market Users VAR/SI When Live
Infosys Legacy Applications Infosys NIA Platform Intelligent Process Automation Artificial Intelligence x x 2016 2017
Subscribe Subscribe Subscribe Chatbots and Conversational AI Artificial Intelligence Subscribe Subscribe 2020 2020
Subscribe Subscribe Subscribe Blockchain Platform Blockchain Subscribe Subscribe 2018 2018

IT Decision Makers and Key Stakeholders at Pfizer


First Name Last Name Title Email Phone
Subscribe Subscribe Director, Business Analytics and Insights Subscribe Subscribe
Subscribe Subscribe Vice President, Business Analytics and Insights Subscribe Subscribe
Subscribe Subscribe Director Global Business Intelligence Subscribe Subscribe
Subscribe Subscribe Vice President, Global Procurement Subscribe Subscribe
Subscribe Subscribe Director, Client Partner, Global Financial Solutions and Travel & Expense Subscribe Subscribe
Subscribe Subscribe Chief Financial Officer Subscribe Subscribe
Subscribe Subscribe Global Procurement Director Meetings and Travel Subscribe Subscribe
Subscribe Subscribe Director, Business Technology Subscribe Subscribe
Subscribe Subscribe Director, Information Management Subscribe Subscribe
Subscribe Subscribe Vice President, Global Procurement -- Pfizer Global Supply Subscribe Subscribe
Subscribe Subscribe Vice President Finance Subscribe Subscribe
Subscribe Subscribe Global Procurement Travel & Meetings Subscribe Subscribe
Subscribe Subscribe Business Technology Client Partner - Travel & Expense Subscribe Subscribe
Subscribe Subscribe Senior Associate Global Procurement Travel & Meetings Team Subscribe Subscribe
Subscribe Subscribe Senior Director, Business Adoption, Global ERP Program Subscribe Subscribe
Subscribe Subscribe Senior Director, Real World Data & Analytics Lead Subscribe Subscribe
Subscribe Subscribe Director - Solution Engineering - Global Business Intelligence CoE Subscribe Subscribe
Subscribe Subscribe Sr. Manager, Data Scientist - Real World Data and Analytics Subscribe Subscribe
Subscribe Subscribe Data Science - Team Leader/Director Subscribe Subscribe
Subscribe Subscribe Vice President, Global Procurement Subscribe Subscribe
Subscribe Subscribe Senior Director, Global Procurement Subscribe Subscribe
Subscribe Subscribe Senior Director, Global Procurement Subscribe Subscribe
Subscribe Subscribe Director, IT Procurement Subscribe Subscribe
Subscribe Subscribe Vice President Operations Subscribe Subscribe
Subscribe Subscribe Chief Human Resources Officer Subscribe Subscribe
Subscribe Subscribe VP Human Resources Subscribe Subscribe
Subscribe Subscribe Director of Payroll Subscribe Subscribe
Subscribe Subscribe Director of Workforce Platform Services Subscribe Subscribe
Subscribe Subscribe Manager, Accounts Receivable Cash Operations Subscribe Subscribe
Subscribe Subscribe Finance Director/Controller Subscribe Subscribe
Subscribe Subscribe Senior Finance Director - Global Commercial Operations and Transformation Subscribe Subscribe
Subscribe Subscribe Vice President, Xeljanz US Marketing Subscribe Subscribe
Subscribe Subscribe Global Marketing Director Subscribe Subscribe
Subscribe Subscribe Director - Consumer Marketing Subscribe Subscribe
Subscribe Subscribe Director, Breast Cancer Global Lifecycle Marketing Subscribe Subscribe
Subscribe Subscribe Marketing Director, Vaccines Subscribe Subscribe
Subscribe Subscribe Director of Marketing Subscribe Subscribe
Subscribe Subscribe Global Marketing Director Subscribe Subscribe
Subscribe Subscribe Executive Vice President and General Counsel Subscribe Subscribe
Subscribe Subscribe Assistant General Counsel Subscribe Subscribe
Subscribe Subscribe Chief Human Resources Officer, Executive Vice President Subscribe Subscribe
Subscribe Subscribe Immigration Coordinator Subscribe Subscribe
Subscribe Subscribe Executive Vice President, Chief Digital and Technology Officer Subscribe Subscribe
Subscribe Subscribe Vice President Human Resources - Worldwide R&D Subscribe Subscribe
Subscribe Subscribe Vice President Finance Subscribe Subscribe
Subscribe Subscribe Senior Manager Business Technology (HR and Compliance) Subscribe Subscribe
Subscribe Subscribe Global People Experience Lead (Human Resources), Corporate Affairs, Legal and Compliance Subscribe Subscribe
Subscribe Subscribe Manager, Contract Management Subscribe Subscribe
Subscribe Subscribe National Sales Director Subscribe Subscribe
Subscribe Subscribe District Sales Manager Subscribe Subscribe
Subscribe Subscribe Interim Regional Director - Sales Subscribe Subscribe
Subscribe Subscribe Regional Sales Director Subscribe Subscribe
Subscribe Subscribe Vice President Enterprise Data and Solutions Architecture Subscribe Subscribe
Subscribe Subscribe Director, Enterprise Data Platform and Cloud Engineering Subscribe Subscribe
Subscribe Subscribe Director, Enterprise Architecture, Data & Analytics Subscribe Subscribe