200: What do you need to pay attention to when using PayPal ?, Thanks

200 Points: What do you need to pay attention to when using PayPal? Thank you! I went to paypal and read his instructions. the more confused I was. I had a paypal account and asked the user to pay from my website. every time I generated an order number, finally, if the user successfully pays for me, how can I do it if PayPal can return the order number to me? Then PayPal is willing to return the information. it must be a page to me. I am 200: What should I pay attention to when receiving the money from PayPal? Thank you!
I went to paypal and read his instructions,
I have a PayPal account and ask the user to pay from my website. each time an order number is generated, and finally if the user successfully pays for me, what can I do if PayPal can return the order number to me?
Then PayPal is willing to return information. it must be a page that is returned to me. how can I identify forged information on this page?


------ Solution --------------------
Up
------ Solution --------------------
Up
------ Solution --------------------
Your form
------ Solution --------------------
Your form is submitted to paypal. a page called for paypal is used in the form. paypal will post data to this page,

On this page, you can use the post data to connect to paypal to verify if it is correct.

There are examples and codes of php ready-made on paypal,
Sandbox can be used for testing, which is very convenient.
------ Solution --------------------
Mark
------ Solution --------------------
Pass by, contact points
------ Solution --------------------
MARK
------ Solution --------------------
It's vague. what do you call me a person who is not familiar with PayPal?
------ Solution --------------------
Mark
------ Solution --------------------
What is PayPal?
------ Solution --------------------
Never used. don't have a pair of underpants
------ Solution --------------------
This is not a master improvement. it should be a skilled employee.
Go to paypaldev
------ Solution --------------------
The example is paypal.com. PayPal should be similar. you can change it to the sandbox address for testing.


Notify_url is the page for sending post data back to paypal. on this page, connect paypal to check whether the transaction is true.
Return is the return page, which has no actual use. Generally, the thank you information is displayed ..
Note that absolute URLs must be submitted for both pages, because they are for paypal and cannot be used as relative URLs.


------ Solution --------------------
Similar to messages sent by most SP :)
------ Solution --------------------
The biggest problem is to pay attention to the database design when a disconnection occurs.