Google Play Authenticate to complete purchase, multiple accounts

I'm using a device running Android 8.1. I'm trying to complete a purchase using Google Play where I'm facing a problem while authenticating myself after I selected my payment method. I have 4 Google accounts linked to my device. I wish to use my primary Google account to authenticate myself, yet the Google Play application picks the account I've added most recently (which is my dads'). For a few hours today and last night I have searched the internet and the settings of my phone trying to find out how I can change the account that Google Play requires me to authenticate with, but I couldn't find a solution. Now I do have the password of the Google account that Google Play prompts me to use (because my dad gave it to me), but I do not want to use that account to authenticate as I want the purcahse to be logged/added to my own (primary) Google account. How can I modify the behavior of Google Play so that I can choose what account is used to authenticate whilst completing a purchase?