Question: What do I need to have in order to file claim for the coronavirus job retention scheme?

Answer passage (source: UK):
page_title: Guidance Claim for wages through the Coronavirus Job Retention Scheme
section_headers: What you’ll need
section_content: To make a claim, you will need:

to be registered for PAYE online
your UK bank account number and sort code (only provide bank account details where a BACS payment can be accepted)
the billing address on your bank account (this is the address on your bank statements)
your employer PAYE scheme reference number
the number of employees being furloughed
each employee’s National Insurance number (you will need to search for their number if you do not have it or contact HMRC if your employee does not have a number)
each employee’s payroll or employee number (optional)
the start date and end date of the claim
the full amounts that you’re claiming for including: 
employee wages
employer National Insurance contributions
employer minimum pension contributions


your phone number
contact name

You also need to provide either:

your name (or the employer’s name if you’re an agent)
your Corporation Tax unique taxpayer reference
your Self Assessment unique taxpayer reference
your company registration number

Using an agent to do PAYE online
If you use an agent who is authorised to do PAYE online for you, they will be
able to claim on your behalf.
If you would like to use an agent, but do not have one authorised to do PAYE
online for you, you can do that by accessing your HMRC online
services and selecting
‘Manage Account’.
You must be enrolled in PAYE online for employers to do this and will need to
ask your agent for their agent ID. Your agent can get this from their HMRC
online service for agents by selecting ‘authorise client.’
You can also use this service to remove authorisation from your agent if you
do not want it to continue after they have submitted your claim(s).
If an agent makes a claim on your behalf you will need to tell them which bank
account you would like the grant to be paid into. You must only provide bank
details where a BACS payment can be accepted.
If you’re putting 100 or more employees on furlough
If you’re claiming for 100 or more furloughed employees, you’ll need to upload
a file containing the following for each employee:

full name
National Insurance number
payroll number (optional)
furlough start date
furlough end date (if known)
full amount claimed

You’ll need ensure that you:

provide only the employee information requested here - if you provide more or less information than required, you may risk delaying your payment and/or be asked to provide the information again
submit one line per employee for the whole period
do not break up the calculation into multiple periods within the claim
do not split data by contract type
upload your file as an .xls, .xlsx, .csv or .ods


Reviewer feedback on this answer:
There is a lot of information here.  The information in the answer includes a list of paperwork needed when filing a claim.
things and conditions need to claim the scheme was given
This lays out what to do and what you will need to apply for this program

Reviewer ratings:
Excellent
Excellent
Excellent