The text doesn't mention anything about installing WhatsApp without Apple Store specifically.

However, based on general information and context provided in your question:

- You can use an alternative method other than a credit card to purchase or download applications from the App Store if you don't have one handy.

To elaborate further:

1. If you want to buy something using funds that are already available within Apple's ecosystem (for example, money you've received as a gift), then yes – these can be used without needing any additional payment information like your credit card details when making purchases online through certain apps such as WhatsApp etc., which might not always require going directly into an actual store itself depending upon how exactly they set things up inside their respective app stores themselves.

In summary, while the text doesn't explicitly mention installing WhatsApp specifically without Apple Store; it does suggest that you can use alternative methods other than a credit card to make purchases or download applications from within Apple's ecosystem.

Install whatsapp without apple store