Some businesses that use Pay By Group allow you and your invitees to pay for your purchase over time in installments. Please note that the number and size of installments are determined by the business whose goods or services you're purchasing and will vary.
Even though there are multiple payments with installments, each group member only has to sign up once for their share of the overall purchase amount. Their card will be charged the appropriate portion of that share as each installment deadline is reached.
Since additional users can join a group as long as final payment has not yet been submitted, even if one or more installments have already been paid, some group members may pay more than they owe based on the final size of the group. In these cases the Pay By Group system will make sure that everyone is charged fairly in the final accounting of the purchase. You can read more about this subject in this article.