Use `redirect` method for `order-pay` endpoints

[codecov[bot]]

Codecov Report

Merging #138 (0e2d90d) into main (8ebecbf) will increase coverage by 0.05%. The diff coverage is n/a.

@@             Coverage Diff              @@
##               main     #138      +/-   ##
============================================
+ Coverage     36.69%   36.74%   +0.05%     
- Complexity      804      810       +6     
============================================
  Files            19       19              
  Lines          3085     3097      +12     
============================================
+ Hits           1132     1138       +6     
- Misses         1953     1959       +6     

Impacted Files	Coverage Δ
...includes/class-wc-gateway-swedbank-pay-trustly.php	73.09% <0.00%> (-0.28%)	:arrow_down:
...s/includes/class-wc-gateway-swedbank-pay-vipps.php	73.84% <0.00%> (-0.25%)	:arrow_down:
...s/includes/class-wc-gateway-swedbank-pay-swish.php	70.58% <0.00%> (-0.21%)	:arrow_down:
...cludes/class-wc-gateway-swedbank-pay-mobilepay.php	66.66% <0.00%> (-0.18%)	:arrow_down:
...includes/class-wc-gateway-swedbank-pay-invoice.php	50.18% <0.00%> (-0.01%)	:arrow_down:
...ents/includes/class-wc-gateway-swedbank-pay-cc.php	46.96% <0.00%> (+<0.01%)	:arrow_up:

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[mergify[bot]]

Thank you @olegisk for your contribution!