post https://sandbox.asaas.com/api/v3/paymentLinks
--
If your customer can pay via bank slip, you'll need to provide the dueDateLimitDays field, which determines the number of business days for payment after the issuance of the slip.
If the payment method is Installment, provide the maxInstallmentCount field to set the maximum number of installments your customer can choose for installment payments.
If the payment method is Subscription, you'll need to send the subscriptionCycle field to determine the frequency of generating the charges.
You can add images to your payment link through this endpoint.