No validate "Proxy Port" in Paypal Module (Paypal Express, Paypal Payflow -Link, Pro, Advanced)

[edenduong]

Preconditions (*)

1. Magento 2.3-develop

Steps to reproduce (*)

1. Go to backend
2. Store->Configurations
3. Sales-> Payment Methods
4. "API Uses Proxy" in Paypal Express, Paypal Payflow, Paypal Pro is "Yes"
5. "Proxy Port" fill "one"
6. Save

Expected result (*)

1. Can not save because it is not number

Actual result (*)

1. Save normally

[m2-assistant]

Hi @edenduong. Thank you for your report.
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@magento give me 2.3-develop instance - upcoming 2.3.x release

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@edenduong do you confirm that you were able to reproduce the issue on vanilla Magento instance following steps to reproduce?

• yes
• no

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[m2-assistant]

Hi @ajijshekh123. Thank you for working on this issue.
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[ajijshekh123]

Give me @magento give me 2.3-develop instance

[magento-engcom-team]

Hi @ajijshekh123. Thank you for your request. I'm working on Magento 2.3-develop instance for you

[magento-engcom-team]

Hi @ajijshekh123, here is your Magento instance.
Admin access: https://i-24304-2-3-develop.instances.magento-community.engineering/admin
Login: admin Password: 123123q
Instance will be terminated in up to 3 hours.

[ajijshekh123]

Currently, It is saved alphabetically words Ex:- One on "Proxy Port" fields, It should not save. It should accept only digits.
See attached screenshot: