The government recently started allowing applicants to pay their mandatory filing fees with a credit card.
After an applicant chooses Boundless and becomes a customer, they will have an opportunity to select whether they want to pay those government filing fees with a check or money order, or if they would like to pay with a credit card.
Boundless includes clear instructions in the green card application package about how to properly provide payment as part of an application before it is sent to the government.
Check out this article for more information on paying government fees with a credit card.