Can’t use PayPal at all with 1.6.3

I’ve just tried 1.6.3. When I click on PayPal on the Checkout page, using my Sandbox account, I get a 503 error in the popup window.

Status report:-

### WordPress Environment ###

WordPress address (URL): https://test3.mike-turner.uk
Site address (URL): https://test3.mike-turner.uk
WC Version: 5.9.0
REST API Version: ? 5.9.0
WC Blocks Version: ? 6.1.0
Action Scheduler Version: ? 3.3.0
WC Admin Version: ? 2.8.0
Log Directory Writable: ?
WP Version: 5.8.2
WP Multisite: –
WP Memory Limit: 1 GB
WP Debug Mode: ?
WP Cron: –
Language: en_GB
External object cache: –

### Server Environment ###

Server Info: Apache/2.4.41 (Ubuntu)
PHP Version: 7.4.25
PHP Post Max Size: 100 MB
PHP Time Limit: 30
PHP Max Input Vars: 1000
cURL Version: 7.68.0
OpenSSL/1.1.1f

SUHOSIN Installed: –
MySQL Version: 8.0.27-0ubuntu0.20.04.1
Max Upload Size: 100 MB
Default Timezone is UTC: ?
fsockopen/cURL: ?
SoapClient: ?
DOMDocument: ?
GZip: ?
Multibyte String: ?
Remote Post: ?
Remote Get: ?

### Database ###

WC Database Version: 5.9.0
WC Database Prefix: mt_
Total Database Size: 29.28MB
Database Data Size: 22.53MB
Database Index Size: 6.75MB
mt_woocommerce_sessions: Data: 0.02MB + Index: 0.02MB + Engine InnoDB
mt_woocommerce_api_keys: Data: 0.02MB + Index: 0.03MB + Engine InnoDB
mt_woocommerce_attribute_taxonomies: Data: 0.02MB + Index: 0.02MB + Engine InnoDB
mt_woocommerce_downloadable_product_permissions: Data: 0.02MB + Index: 0.06MB + Engine InnoDB
mt_woocommerce_order_items: Data: 0.06MB + Index: 0.02MB + Engine InnoDB
mt_woocommerce_order_itemmeta: Data: 0.30MB + Index: 0.36MB + Engine InnoDB
mt_woocommerce_tax_rates: Data: 0.02MB + Index: 0.06MB + Engine InnoDB
mt_woocommerce_tax_rate_locations: Data: 0.02MB + Index: 0.03MB + Engine InnoDB
mt_woocommerce_shipping_zones: Data: 0.02MB + Index: 0.00MB + Engine InnoDB
mt_woocommerce_shipping_zone_locations: Data: 0.02MB + Index: 0.03MB + Engine InnoDB
mt_woocommerce_shipping_zone_methods: Data: 0.02MB + Index: 0.00MB + Engine InnoDB
mt_woocommerce_payment_tokens: Data: 0.02MB + Index: 0.02MB + Engine InnoDB
mt_woocommerce_payment_tokenmeta: Data: 0.02MB + Index: 0.03MB + Engine InnoDB
mt_woocommerce_log: Data: 0.02MB + Index: 0.02MB + Engine InnoDB
mt_actionscheduler_actions: Data: 0.16MB + Index: 0.16MB + Engine InnoDB
mt_actionscheduler_claims: Data: 0.02MB + Index: 0.02MB + Engine InnoDB
mt_actionscheduler_groups: Data: 0.02MB + Index: 0.02MB + Engine InnoDB
mt_actionscheduler_logs: Data: 0.13MB + Index: 0.13MB + Engine InnoDB
mt_aiowps_events: Data: 0.02MB + Index: 0.00MB + Engine InnoDB
mt_aiowps_failed_logins: Data: 0.02MB + Index: 0.00MB + Engine InnoDB
mt_aiowps_global_meta: Data: 0.02MB + Index: 0.00MB + Engine InnoDB
mt_aiowps_login_activity: Data: 0.11MB + Index: 0.00MB + Engine InnoDB
mt_aiowps_login_lockdown: Data: 0.02MB + Index: 0.00MB + Engine InnoDB
mt_aiowps_permanent_block: Data: 0.02MB + Index: 0.00MB + Engine InnoDB
mt_cli_cookie_scan: Data: 0.02MB + Index: 0.00MB + Engine InnoDB
mt_cli_cookie_scan_categories: Data: 0.02MB + Index: 0.02MB + Engine InnoDB
mt_cli_cookie_scan_cookies: Data: 0.02MB + Index: 0.03MB + Engine InnoDB
mt_cli_cookie_scan_url: Data: 0.02MB + Index: 0.00MB + Engine InnoDB
mt_cli_scripts: Data: 0.02MB + Index: 0.00MB + Engine InnoDB
mt_commentmeta: Data: 0.02MB + Index: 0.03MB + Engine InnoDB
mt_comments: Data: 0.22MB + Index: 0.25MB + Engine InnoDB
mt_eum_logs: Data: 0.20MB + Index: 0.00MB + Engine InnoDB
mt_frm_fields: Data: 0.06MB + Index: 0.03MB + Engine InnoDB
mt_frm_forms: Data: 0.02MB + Index: 0.02MB + Engine InnoDB
mt_frm_item_metas: Data: 0.08MB + Index: 0.03MB + Engine InnoDB
mt_frm_items: Data: 0.06MB + Index: 0.08MB + Engine InnoDB
mt_links: Data: 0.02MB + Index: 0.02MB + Engine InnoDB
mt_ms_snippets: Data: 0.02MB + Index: 0.00MB + Engine InnoDB
mt_options: Data: 10.50MB + Index: 0.33MB + Engine InnoDB
mt_postmeta: Data: 2.52MB + Index: 3.03MB + Engine InnoDB
mt_posts: Data: 4.52MB + Index: 0.41MB + Engine InnoDB
mt_redirection_404: Data: 0.02MB + Index: 0.05MB + Engine InnoDB
mt_redirection_groups: Data: 0.02MB + Index: 0.03MB + Engine InnoDB
mt_redirection_items: Data: 0.02MB + Index: 0.09MB + Engine InnoDB
mt_redirection_logs: Data: 0.02MB + Index: 0.05MB + Engine InnoDB
mt_sgs_log_events: Data: 1.52MB + Index: 0.00MB + Engine InnoDB
mt_sgs_log_visitors: Data: 0.02MB + Index: 0.00MB + Engine InnoDB
mt_snippets: Data: 0.02MB + Index: 0.00MB + Engine InnoDB
mt_stock_log: Data: 0.02MB + Index: 0.00MB + Engine InnoDB
mt_term_relationships: Data: 0.02MB + Index: 0.02MB + Engine InnoDB
mt_term_taxonomy: Data: 0.02MB + Index: 0.03MB + Engine InnoDB
mt_termmeta: Data: 0.02MB + Index: 0.03MB + Engine InnoDB
mt_terms: Data: 0.02MB + Index: 0.03MB + Engine InnoDB
mt_usermeta: Data: 0.06MB + Index: 0.03MB + Engine InnoDB
mt_users: Data: 0.02MB + Index: 0.05MB + Engine InnoDB
mt_wc_admin_note_actions: Data: 0.02MB + Index: 0.02MB + Engine InnoDB
mt_wc_admin_notes: Data: 0.05MB + Index: 0.00MB + Engine InnoDB
mt_wc_category_lookup: Data: 0.02MB + Index: 0.00MB + Engine InnoDB
mt_wc_customer_lookup: Data: 0.02MB + Index: 0.03MB + Engine InnoDB
mt_wc_download_log: Data: 0.02MB + Index: 0.03MB + Engine InnoDB
mt_wc_order_coupon_lookup: Data: 0.02MB + Index: 0.03MB + Engine InnoDB
mt_wc_order_product_lookup: Data: 0.08MB + Index: 0.06MB + Engine InnoDB
mt_wc_order_stats: Data: 0.06MB + Index: 0.05MB + Engine InnoDB
mt_wc_order_tax_lookup: Data: 0.02MB + Index: 0.03MB + Engine InnoDB
mt_wc_product_meta_lookup: Data: 0.02MB + Index: 0.09MB + Engine InnoDB
mt_wc_reserved_stock: Data: 0.02MB + Index: 0.00MB + Engine InnoDB
mt_wc_tax_rate_classes: Data: 0.02MB + Index: 0.02MB + Engine InnoDB
mt_wc_webhooks: Data: 0.02MB + Index: 0.02MB + Engine InnoDB
mt_wpmailsmtp_debug_events: Data: 0.02MB + Index: 0.00MB + Engine InnoDB
mt_wpmailsmtp_tasks_meta: Data: 0.05MB + Index: 0.00MB + Engine InnoDB
mt_yoast_indexable: Data: 0.48MB + Index: 0.38MB + Engine InnoDB
mt_yoast_indexable_hierarchy: Data: 0.06MB + Index: 0.05MB + Engine InnoDB
mt_yoast_migrations: Data: 0.02MB + Index: 0.02MB + Engine InnoDB
mt_yoast_primary_term: Data: 0.02MB + Index: 0.03MB + Engine InnoDB
mt_yoast_seo_links: Data: 0.19MB + Index: 0.17MB + Engine InnoDB

### Post Type Counts ###

attachment: 392
cookielawinfo: 25
custom_css: 2
customize_changeset: 31
dflip: 1
frm_form_actions: 5
frm_styles: 1
jetpack_migration: 2
ml-slide: 18
ml-slider: 1
nav_menu_item: 39
page: 49
post: 37
product: 14
product_variation: 54
revision: 716
rl_gallery: 5
shop_order: 285
shop_order_refund: 86
tablepress_table: 15
ufaq: 3
wp_block: 1
wpplugin_don_button: 2
wpplugin_don_order: 4
ywcm_message: 1

### Security ###

Secure connection (HTTPS): ?
Hide errors from visitors: ?

### Active Plugins (33) ###

404page – your smart custom 404 error page: by Peter Raschendorfer – 11.3.0
Add From Server: by Dion Hulse – 3.4.5
Astra Bulk Edit: by Brainstorm Force – 1.2.6
Astra Widgets: by Brainstorm Force – 1.2.9
Code Snippets: by Code Snippets Pro – 2.14.3
GDPR Cookie Consent: by WebToffee – 2.0.6
Font Awesome: by Font Awesome – 4.0.4
Formidable Forms: by Strategy11 – 5.0.14
Site Kit by Google: by Google – 1.47.0
Jetpack Without Promotions: by required – 1.1.0
Jetpack: by Automattic – 10.4
MetaSlider: by MetaSlider – 3.23.5
PayPal Donations: by Tips and Tricks HQ
Johan Steen – 1.9.7

Redirection: by John Godley – 5.1.3
Responsive Lightbox & Gallery: by dFactory – 2.3.3
SiteGround Security: by SiteGround – 1.1.3
Easy Updates Manager: by Easy Updates Manager Team – 9.0.11
Surbma | WooCommerce Without Marketplace Suggestions: by Surbma – 2.1
SVG Support: by Benbodhi – 2.3.19
TablePress: by Tobias B?thge – 1.14
Ultimate Addons for Gutenberg: by Brainstorm Force – 1.25.2
Ultimate FAQ – WordPress FAQ and Accordion Plugin: by – 2.0.26
UpdraftPlus – Backup/Restore: by UpdraftPlus.Com
DavidAnderson – 1.16.66

User Role Editor: by Vladimir Garagulya – 4.60.2
WooCommerce PayPal Payments: by WooCommerce – 1.6.3
WooCommerce Product Dependencies: by SomewhereWarm – 1.2.7
Stock Manager for WooCommerce: by StoreApps – 2.8.3
WooCommerce: by Automattic – 5.9.0
Yoast SEO: by Team Yoast – 17.8
WP Content Copy Protection & No Right Click: by wp-buy – 3.4.2
WP Mail SMTP: by WPForms – 3.2.1
WP Rollback: by Impress.org – 1.7.1
YITH WooCommerce Cart Messages: by YITH – 1.8.0

### Inactive Plugins (1) ###

SiteGround Optimizer: by SiteGround – 6.0.5

### Settings ###

API Enabled: –
Force SSL: –
Currency: GBP (￡)
Currency Position: left
Thousand Separator: ,
Decimal Separator: .
Number of Decimals: 2
Taxonomies: Product Types: external (external)
grouped (grouped)
simple (simple)
variable (variable)

Taxonomies: Product Visibility: exclude-from-catalog (exclude-from-catalog)
exclude-from-search (exclude-from-search)
featured (featured)
outofstock (outofstock)
rated-1 (rated-1)
rated-2 (rated-2)
rated-3 (rated-3)
rated-4 (rated-4)
rated-5 (rated-5)

Connected to WooCommerce.com: ?

### WC Pages ###

Shop base: #429 – /shop/
Basket: #431 – /basket/
Checkout: #433 – /checkout/
My account: #435 – /my-account/
Terms and conditions: ? Page not set

### Theme ###

Name: Astra
Version: 3.7.5
Author URL: https://wpastra.com/about/?utm_source=theme_preview&utm_medium=author_link&utm_campaign=astra_theme
Child Theme: ? – If you are modifying WooCommerce on a parent theme that you did not build
personally we recommend using a child theme. See: How to create a child theme

WooCommerce Support: ?

### Templates ###

Overrides: –

### WooCommerce PayPal Payments ###

Onboarded: ?
Shop country code: GB
WooCommerce currency supported: ?
PayPal card processing available in country: ?
Pay Later messaging available in country: ?
Webhook status: ?
Vault enabled: ?
Logging enabled: ?
Reference Transactions: ?
Used PayPal Checkout plugin: –

### Action Scheduler ###

Complete: 432
Oldest: 2021-11-14 12:35:05 +0000
Newest: 2021-12-14 14:01:15 +0000

Pending: 1
Oldest: 2021-12-20 20:35:06 +0000
Newest: 2021-12-20 20:35:06 +0000

### Status report information ###

Generated at: 2021-12-14 14:35:05 +00:00

Log file:-

2021-12-14T14:29:05+00:00 DEBUG POST https://api.sandbox.paypal.com/v1/identity/generate-token
Response Debug ID: 9fc3b09cb6a99
Response: Array
(
    [code] => 200
    [message] => OK
)

2021-12-14T14:29:45+00:00 DEBUG POST https://api.sandbox.paypal.com/v2/checkout/orders
Request Body: {"intent":"CAPTURE","purchase_units":[{"reference_id":"default","amount":{"currency_code":"GBP","value":"12.50","breakdown":{"item_total":{"currency_code":"GBP","value":"10.00"},"shipping":{"currency_code":"GBP","value":"2.50"},"tax_total":{"currency_code":"GBP","value":"0.00"}}},"description":"","items":[{"name":"2022 Clan Line Calendar","unit_amount":{"currency_code":"GBP","value":"10.00"},"quantity":1,"description":"2022 Clan Line calendar featuring photographs of Merchant Navy class locomotive Clan Line, no. 35028.","sku":"","category":"PHYSICAL_GOODS","tax":{"currency_code":"GBP","value":"0.00"}}],"payee":{"merchant_id":"FZ7FXKKLVVKG8"},"shipping":{"name":{"full_name":" "},"address":{"country_code":"GB","address_line_1":"66 Manor Road","address_line_2":"","admin_area_1":"","admin_area_2":"Martlesham Heath","postal_code":"i"}}}],"application_context":{"user_action":"CONTINUE","shipping_preference":"SET_PROVIDED_ADDRESS","landing_page":"LOGIN","locale":"en-GB","brand_name":"Clan Line Testing","return_url":"https:\/\/test3.mike-turner.uk\/?wc-ajax=ppc-return-url","cancel_url":"https:\/\/test3.mike-turner.uk\/checkout\/"},"payment_method":{"payee_preferred":"UNRESTRICTED","payer_selected":"PAYPAL"}}
Response Debug ID: 619b09581b0e9
Response: Array
(
    [code] => 201
    [message] => Created
)

2021-12-14T14:29:46+00:00 DEBUG POST https://api.sandbox.paypal.com/v2/checkout/orders
Request Body: {"intent":"CAPTURE","purchase_units":[{"reference_id":"default","amount":{"currency_code":"GBP","value":"12.50","breakdown":{"item_total":{"currency_code":"GBP","value":"10.00"},"shipping":{"currency_code":"GBP","value":"2.50"},"tax_total":{"currency_code":"GBP","value":"0.00"}}},"description":"","items":[{"name":"2022 Clan Line Calendar","unit_amount":{"currency_code":"GBP","value":"10.00"},"quantity":1,"description":"2022 Clan Line calendar featuring photographs of Merchant Navy class locomotive Clan Line, no. 35028.","sku":"","category":"PHYSICAL_GOODS","tax":{"currency_code":"GBP","value":"0.00"}}],"payee":{"merchant_id":"FZ7FXKKLVVKG8"},"shipping":{"name":{"full_name":" "},"address":{"country_code":"GB","address_line_1":"66 Manor Road","address_line_2":"","admin_area_1":"","admin_area_2":"Martlesham Heath","postal_code":"i"}}}],"application_context":{"user_action":"CONTINUE","shipping_preference":"SET_PROVIDED_ADDRESS","landing_page":"LOGIN","locale":"en-GB","brand_name":"Clan Line Testing","return_url":"https:\/\/test3.mike-turner.uk\/?wc-ajax=ppc-return-url","cancel_url":"https:\/\/test3.mike-turner.uk\/checkout\/"},"payment_method":{"payee_preferred":"UNRESTRICTED","payer_selected":"PAYPAL"}}
Response Debug ID: 4c01ce65efe96
Response: Array
(
    [code] => 201
    [message] => Created
)

2021-12-14T14:35:05+00:00 DEBUG POST https://api.sandbox.paypal.com/v1/billing-agreements/agreement-tokens
Request Body: {"description":"Checking if reference transactions are enabled","payer":{"payment_method":"PAYPAL"},"plan":{"type":"MERCHANT_INITIATED_BILLING","merchant_preferences":{"return_url":"https:\/\/example.com\/return","cancel_url":"https:\/\/example.com\/cancel","skip_shipping_address":true}}}
Response Debug ID: 81aeb29a72dea
Response: Array
(
    [code] => 201
    [message] => Created
)