WordPress at a glance
function is not described

woocommerce_account_add_payment_method() WC 1.0

My Account > Add payment method template.

No Hooks.

Return

null. Nothing.

Usage

woocommerce_account_add_payment_method();

Code of woocommerce_account_add_payment_method() WC 5.2.2

<?php
function woocommerce_account_add_payment_method() {
	WC_Shortcode_My_Account::add_payment_method();
}