add_filter('frm_stripe_payment_method_types', 'add_us_bank_account');
function add_us_bank_account( $payment_method_types ) {
	$payment_method_types = array( 'card', 'link', 'us_bank_account' );
	return $payment_method_types;
}

Use this code example to add support for SOFORT, iDEAL, and Bancontact one time payments when using euros. Note: Subscriptions are currently not supported.

add_filter('frm_stripe_payment_method_types', 'add_sofort_ideal_bancontact');
function add_sofort_ideal_bancontact( $payment_method_types ) {
	$payment_method_types = array( 'sofort', 'ideal', 'bancontact' );
	return $payment_method_types;
}

Use this code example where the only payment method type is WeChat Pay for a form with 5 as its ID.

add_filter('frm_stripe_payment_method_types', 'add_wechat_pay', 10, 2);
function add_wechat_pay( $payment_method_types, $args ) {
	$form_id        = $args['form_id'];
	$target_form_id = 5; // Change 5 to the ID of your form
	if ( $target_form_id === $form_id ) {
		$payment_method_types[] = 'wechat_pay';
	}
	return $payment_method_types;
}

Use this code example to map the form with ID 75 to use affirm as its only payment method and form ID 76 to use card, link, and klarna.

add_filter('frm_stripe_payment_method_types', 'filter_stripe_payment_method', 10, 2);
function filter_stripe_payment_method( $payment_method_types, $args ) {
	$map     = array(
		75 => array( 'affirm' ),
        76 => array( 'card', 'link', 'klarna' ),
	);
	$form_id = $args['form_id'];

	if ( isset( $map[ $form_id ] ) ) {
		$payment_method_types = $map[ $form_id ];
	}

	return $payment_method_types;
}