The site uses the Stripe payment gateway to collect payment from buyers and pay the amount to the sellers. Hence in order to receive your payment as a seller, you need to have a stripe account and you have to update your stripe public key and secret key in the edit profile page of your account.
If you don't have a stripe account yet, follow this link to create one now.
Stripe account creation link-https://dashboard.stripe.com/register
If you already have a stripe account but unsure of how to get your stripe publishable key and secret key from your stripe account, please follow this reference link to get your stripe keys.
Kindly make sure that you update your stripe account secret key in the edit profile page stripe private key field and your stripe publishable key in the edit profile page stripe public key field.
Without updating these stripe keys you won't be able to receive your payments from your buyers. Hence it is mandatory to update your stripe details.