Pension Credit application with overseas pension (no proof)

When applying for pension credit for over 65 is pension being received overseas taken into account in the application pension credit; even though you don't have access to the funds or know the amount.

Is their any proof needed to supply for overseas pension?

Don't have any proof/doc for the pension credit ; kindly advise as can not go from UK because of personal circumstances to attempt to get these proof/docs of pension credit.

is their a minimal amount you receive in pension credit even though you have not worked in this country and don't have tax number?

Seems to have mentioned the pension on the naturalization application Form.

If their is any recent applicant of pension credit who has recently acquired citizenship and has worked abroad and is receiving any negligible pension would be kind enough to share their experience for pension credit application ?

thank you for your advice in advance

what is the immigration status?

Recently acquired British citizenship.