Applying online and technical help

• I received a letter asking me to pay additional fees for my Express Entry application. How do I pay the additional fees?
• What do I do if I have technical problems when applying online?
• What is a personal document checklist?
• What is a personal reference code?
• What do I do if an online application is down?
• Who can I contact if I have questions about GCKey or Sign-In Partner?
• How do I get a GCKey credential?
• What do I do if I lost my GCKey username or password?
• I recently reset my IRCC secure account, but I don’t see my application. How can I get it back?
• How do I upload more supporting documents after I have already submitted my online application for permanent residence through Express Entry?