What is issue in my code Sandbox paypal future payment

What is issue in my code Sandbox paypal future payment

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PHP Curl Paypal Sandbox

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Unable to use Paypal API on an SSL website

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How to emulate a curl request using node-fetch module

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Get access token from Paypal in Python - Using urllib2 or requests library

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Update paypal billing plan (payment_definitions)

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Can't refund order using Paypal API

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PayPal Rest SDK API - Get Token

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Invalid token error with Paypal Invoice api when executed using cURL

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PayPal sandbox API SSL error after TLS 1.2 upgrade errno 54

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Paypal sandbox exception "Unable to communicate with the PayPal gateway" Magento

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paypal rest api payment call returning 401 using php

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Paypal Express checkout + php cURL Execute payment not show payment notification on sandbox

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Get user information in PayPal sandbox environment

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Retrieve paypal customer Information Using a valid access token

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