WordPress at a glance
filter is not described

woocommerce_pay_order_button_text filter-hook . WC 1.0

Usage

add_filter( 'woocommerce_pay_order_button_text', 'filter_function_name_3025' );
function filter_function_name_3025( $__ ){
	// filter...

	return $__;
}
$__
-

Where the hook is called

WC_Shortcode_Checkout::order_pay()
woocommerce_pay_order_button_text
woocommerce/includes/shortcodes/class-wc-shortcode-checkout.php 191
'order_button_text'  => apply_filters( 'woocommerce_pay_order_button_text', __( 'Pay for order', 'woocommerce' ) ),

Where in WP core the hook is used WooCommerce

Usage not found.