PayPal API Error - This payment request must be authorized by the sender

Question

In adaptive Paypal with a chain delay, the initial payment is sent successfully, when I make a payment using a payment key, it shows an error similar to this

How can I allow sending the amount to the secondary from the primary receiver

PayPal API Error responseEnvelope.timestamp: 2012-10-31T01:12:05.386-07:00 responseEnvelope.ack: Failure responseEnvelope.correlationId: fd2c71e75c133 responseEnvelope.build: 3988550 error(0).errorId: 550001 error(0).domain: PLATFORM error(0).subdomain: Application error(0).severity: Error error(0).category: Application error(0).message: This payment request must be authorized by the sender 

Answer 1

I received this error when I tried to make a payment, this user has not yet paid, that is, you make a payment request, then you receive a payment key, and then using this payment key, the user must follow the URL and pay (the money will go to to the main receiver), and in the end you have to make a payment to transfer money to the secondary receivers.

Url, which I used in the sandbox to pay by user:

 https://www.sandbox.paypal.com/webscr&cmd=_ap-payment&paykey={{pay_key}}, 

where {{pay_key}} is the key to the payment request.