Only allow SeQura payment for orders above a certain value

disable_sequra_for_low_values.php

<?php

// First of all define the minimum value on a constant, for easy change - Ideally this would be loaded from an option on the settings
define( 'SEQURA_MIN_VALUE', 200 );

// Set the filters
add_filter( 'woocommerce_available_payment_gateways', 'disable_sequra_for_low_values' );
add_filter( 'woocommerce_sq_is_available_in_product_page', 'disable_sequra_for_low_values_product_page', 10, 2 );

// Hide it on the checkout
function disable_sequra_for_low_values( $available_gateways ) {
	if ( defined( 'SEQURA_MIN_VALUE' ) && floatval( SEQURA_MIN_VALUE ) > 0 && isset( $available_gateways['sequra'] ) ) {
		$value_to_pay = null;
		// Order total (pay form on My account) or cart total (regular checkout)?
		$pay_slug = get_option( 'woocommerce_checkout_pay_endpoint', 'order-pay' );
		$order_id = absint( get_query_var( $pay_slug ) );
		if ( $order_id > 0 ) {
			// Pay for on My Account
			$order        = wc_get_order( $order_id );
			$value_to_pay = $order->get_total();
		} else {
			// Regular checkout?
			if ( ! is_null( WC()->cart ) ) {
				$value_to_pay = WC()->cart->total;
			} else {
				// No cart? Where are we? We shouldn't unset the payment gateway
			}
		}
		if ( ! is_null( $value_to_pay ) ) {
			if ( floatval( $value_to_pay ) < floatval( SEQURA_MIN_VALUE ) ) {
				unset( $available_gateways['sequra'] );
			}
		}
	}
	return $available_gateways;
}

// Hide it on the product page (simple products only)
function disable_sequra_for_low_values_product_page( $bool, $product_id ) {
	if ( $bool && defined( 'IHD_SEQURA_MIN_VALUE' ) && floatval( IHD_SEQURA_MIN_VALUE ) > 0 ) {
		if ( $product = wc_get_product( $product_id ) ) {
			// We can only do this for simple products as we have no way to know the selected variation
			if ( $product->get_type() == 'simple' ) {
				if ( floatval( $product->get_price() ) < floatval( IHD_SEQURA_MIN_VALUE ) ) {
					return false;
				}
			}
		}
	}
	return $bool;
}